A red train traveling at 72 km/h and a green train traveling at 144 km/h are headed toward each other on a straight, level track. When they are 950 m apart, each engineer sees the other's train and applies the breaks. The brakes slow each train at the rate of 1.0 m/s^2. Is there a collision? If so, what is the speed of the red train and the speed of the green train? If not, what is the separation between the trains when they stop?

Q: If an object initially at rest is given a velocity of: vx =-1.93 m/s and vy = 2.51 m/s. What is the…

A:

Q: A student in Physics 211 decides to do an experiment. They travel to a city and climb to the roof of…

A: height of building (h) = 300 m initial velocity of first rock (u1) = 0 msinitial velocity of second…

Q: Monika and Sameer walk towards one another along perpendicular paths. A flag is placed at the point…

A: Given: Monika begins 100 m North of flag with speed vm = 0.8 m/s relative to ground Sameer begins…

Q: In traveling a distance of 4.5 km between points A and D, a car is driven at 119 km/h from A to B…

A: Given: Total distance sAD=4.5 km=4500 m Velocity of car from A to B vAB=119 km/h=1191000m3600s=33.05…

Q: A student throws a set of keys vertically upward to her sorority sister, who is in a window 2.90 m…

A:

Q: In traveling a distance of 2.4 km between points A and D, a car is driven at 97 km/h from A to B for…

A: Given that,  distance between A and D  = 2.4  km  1 km / h =  5 /18 m/sec  velocity between point A…

Q: A   student  throws a  ball  upward in  the  vertical  direction  at  the base of  a  hill 40.0…

A: Given data: Height of hill is, h=40 m. Colliding height of both balls is, h'=20 m.

Q: A car is stopped at a traffic light. It then travels along a straight road such that its distance…

A:

Q: A red train travelling at 72 km/h and a green train travelling at 144 km/h are headed toward each…

A:

Q: A bath toy is floating stationary in water such that half of the toy is above water and half of the…

A:

Q: Car B is traveling a distanced ahead of car A. Both cars are traveling at 60 ft/s when the driver of…

A:

Q: During astronaut training, the person rides a simulated rocket, accelerating from rest to maximum…

A: Calculate the acceleration opposite to the direction of motion by using the kinematics equation,…

Q: Nerve impulses travel at different speeds, depending on the type of fiber through which they move.…

A:

Q: An object moves along a straight line and experiences a constant acceleration of +1.53 cm/s2. At t =…

A:

Q: Colonel John P. Stapp, USAF, participated in studying whether a jet pilot could survive emergency…

A: Given, Initial speed is 632 mi/h and time in which he comes to rest is 1.40 s

Q: A jet plane lands at a speed of V m/s and travels at the constant speed of V m/s for the first 5 s…

A: Given value--- A jet plane lands at a speed of V m/s and travels at the constant speed of V m/s for…

Q: Which one of the following objects has a average speed of 20 mi/hour? O A car moves a distance of 40…

A: Required : Which car has velocity 20 miles/hr

Q: A bullet is fired through a board 20.0 cm thick in such a way that the bullet's line of motion is…

A:

Q: object is moving along the x-axis. At t = 0 it is at x = 0. Its x-component of velocity Vx as a…

A: Given  At t =0, X =0  Vx(t) = at - Bt3, where a = 6.8 m/s2 and B = 4.0 m/s4  at ,t = 1.8 sec , Vx(t)…

Q: A particle moving in the x-y plane has a velocity at time t = 5.25 s given by (3.9i+ 6.0j) m/s, and…

A: Write the given values with the suitable variables. t1=5.25 su=3.9i+6j m/st2=5.34 sv=4.05i+6.13j m/s…

Q: n traveling a distance of 3.0 km between points A and D, a car is driven at 87 km/h from A to B for…

A: total distance = s = 3 km from A to B SPEED = Vb=  87 km/h

Q: A car is moving towards the left, which is the negative X direction. It travels 49.2 m during a…

A: The objective of the question is to find the X component of the car’s average velocity during the…

Q: The head injury criterion (HIC) is used to assess the likelihood of head injuries arising from…

A: Let F denote the force, m denote the mass, aavg denote the average acceleration. Therefore,

Q: In a local diner, a customer slides an empty coffee cup down the counter for a refill. The cup…

A:

Q: The driver of a car is initially moving at a constant speed of 70.4 km/h when a traffic light turns…

A: Initial speed of the car is V = 70.4 km/h  Reaction time is t = 0.520 s

Q: Exercise No 5: Two trains, one traveling at 72 km/h and the other at 144 km/h, are headed toward one…

A:

Q: A bullet is fired through a board 13.0 cm thick in such a way that the bullet's line of motion is…

A: Initial speed of the bullet u= 450 m/sFinal speed of the bullet v= 350 m/sThickness of board d= 13.0…

Q: A spacecraft is traveling with a velocity of Vox = 5900 m/s along the +x direction. Two engines are…

A: Initial velocity of the spacecraft (vox) = 5900 ms , in + x direction initial vertical velocity…

Q: Most important in an investigation of an airplane crash by the U.S. National Transportation Safety…

A: Acceleration (a) = - 3450 g where "g" is the acceleration due to gravity Time (t) = 6.49 ms Final…

Q: boy throws a ball upward in the vertical direction at the base of a hill 40 m high while his friend…

A: Find the time period of the balls collide with each other at certain height. t=2hg=220 m9.8…

Q: Lisa in her Lamborghini accelerates at the rate of (3.401-4.20j) m/s², while Jill in her Jaguar…

A: Given, Acceleration of Lisa aL=3.40 i^-4.20 j^ m/s2 Acceleration of Jill aJ=2.20 i^+2.60 j^ m/s2…

Q: A car is traveling at the speed of V m/s on a straight, level road. After the brakes are applied at…

A: Given: the position of car , s = (1/112)(t^3) - t^2 + 10t, the velocity of car ,v = ds /dt…

Q: The motion of a dog is observed to be given by the function 7 = (1.69 m/s²) t² - [(0.4 m/s³) t³-3.61…

A: Given: The position of the dog is given as. r→=1.69 m/s2t2i^-0.4 m/s3t3-3.61 mj^…

Q: is on a street that has a posted speed limit of vm=75 km/hr and is traveling above the speed limit…

A: GivenSpeed limit, vm=75 km/hSpeed of driver above speed limit, vc=28 km/hDistance between driver and…

Q: A person on the top of a roof of a building (100 m) drops a ball. After 2s passed, a person who…

A: Given: The height of the building is 100 m. The person on the ground throws another ball after 2 s…

Q: An unidentified flying object (UFO) is observed to travel a total distance of 29000 m, starting and…

A: We have, UFO travel to a total distance of 29000 m time duration, T = 4.77 s 1 g = 9.8 m/s2

Q: Ballistics experts are able to identify the weapon that fired a certain bullet by studying the…

A:

Q: An iceboat sails across the surface of a frozen lake with constant acceleration produced by the…

A: Given data:  Initial velocity (Vi ) = (2.69 î - 2.98 ĵ)m/s Time (t) = 3.00 s Final velocity (Vf) =…

Q: The engineer of a passenger train traveling at 25.0 m/s sights a freight train whose caboose is 200…

A: (1)Initial Velocity,(u)=25 m/sec --------(1) [Given] freight train ahead distance,(x)=200 m…

Q: An object moves along a straight line and experiences a constant acceleration of +1.36 cm/s2. At t =…

A:

Q: In traveling a distance of 3.2 km between points A and D, a car is driven at 96 km/h from A to B for…

A:

Q: You are in an elevator that is initially at rest. At t = 0, it heads downwards and speeds up as a…

A: Initial velocity of the elevator (u) = 0 msthe time varying velocity of elevator is given by :v(t) =…

Q: A typical jetliner lands at a speed of 160 mi/h and decelerates at the rate of (10.0 mi/h)/s. If the…

A:

Q: rtcile is given by the equation v = 5.0 t - 0.60 t2 (in m/s). At t=0, the particle is at rest. At…

A: Givenv=5 t-0.6 t2  (m/s)

Relative Velocity

It is a measurement of an object with regards to the other object which is moving or stable or stationary. For example, if we are traveling in a bus and the bus is moving at speed of 50km/hr, then our speed is according to the nearby passenger on the bus is zero. According to them, we are not moving. But if one person standing on the ground or road observes us from outside of the bus, according to him we are moving at a speed of 50km/hr and the bus is also moving at a speed of 50km/hr. Now, the motion is recognized by the observer, it depends on a frame of reference or observer. This is motion called relative motion.