A teenager is pushing a cart.  There is no friction between the cart and the ground. Mass of the cart is 120 kg. Cart is initially at rest (at time = 0 s). Direction to the right is positive. He pushed the cart for 5 s (from t = 0 s to t = 5 s) with a force of 75 N to the right hand side. Then he stopped pushing for 5 s (from t = 5 s to t = 10 s). Then he pushed the cart for 10 s (from t = 10 s to t = 20 s) with a force of 75 N to the left hand side.  Question: Calculate the kinetic energy of the cart at  t = 5 s.

Q: A 4.0 kg toy car can move along an x axis. The figure gives Fx of the force acting on the car, which…

A:

Q: A flea jumps by exerting a force of 1.32 x 10 N straight down on the ground. A breeze blowing on the…

A: force exerted by flea = 1.32 x 10-5 N  down wardbut according Newtons third lawforce acting on flea…

Q: Alex is asked to move two boxes of books in contact with each other and resting on a rough floor. He…

A:

Q: A cart of mass 8.00 kg was moved by applying two constant forces. Force 1 is 28.0 N at 42.0°, and…

A: Given: mass of cart, m = 8.0 kgForce, F1 = 28.0 N at 42°Force, F2 = 13 N at 110°

Q: Two people are pushing a truck across a parking lot. The truck has a mass of about 2 × 10 kg. First,…

A:

Q: As a fish jumps vertically out of the water, assume that only two significant forces act on it: an…

A:

Q: A 67.3 kg person is standing inside an elevator. The elevator is traveling from the 1st floor to the…

A: Consider the person’s mass be m, its weight be w, the speed of the elevator be u, the normal…

Q: An elevator filled with passengers has a total mass of 1960 kg and is suspended from a single cable.…

A: Total mass of elevation with passengers m = 1960 kgInitial the elevator is at rest so, u = 0The…

Q: object has a velocity (3.5 m/s)i + (-4.76 m/s)j + (4.68 m/s)k. In a time of 3.21 s its velocity…

A:

Q: An electron is a subatomic particle (m = 9.11 x 10-31 kg) that is subject to electric forces. An…

A: First, we need to calculate the acceleration of the electron. We can use the equation of motion: v2…

Q: A unicorn running on a beach at 7 m/s changes speed at a constant rate of 3.6 m/s2 over a period of…

A:

Q: A 50.0 kg man standing on a spring scale takes a descending elevator ride (DOWNWARD). Starting from…

A:

Q: An electron is a subatomic particle (m = 9.11 x 10*31 kg) that is subject to electric forces. An…

A:

Q: At launch a rocket has a mass of 3.66×104 kg, and the thrust of the engines is 5.34×105 N. If the…

A: Given  Mass of rocket,M = 3.66× 104 kg  Thrust, F = 5.34×105 N  Acceleration due to gravity,g = 9.81…

Q: Akash and Beth are on skateboards. Beth and her skateboard have a combined mass of 62 kg. Akash and…

A: Mass of Akash + skateboard = 150 kg  Mass of Beth + skateboard = 62 kg  Force applied by Beth on…

Q: In a performance test, each of two cars takes 8.7 s to accelerate from rest to 27 m/s. Car A has a…

A:

Q: A lineman is trying to push a training dummy with a force F₁ downward at an angle of 0=39.15°. His…

A: To solve for the coefficient of static friction (μs​) between the dummy and the ground, we need to…

Q: The figure shows a 100-kg block being released from rest from a height of 1.0 m. It then takes 0.64…

A: Given: The height of the 100 kg object from the ground is  m. The initial velocity of the system is…

Q: a. 1.95 N b. 0.75 N c. 1.00 N

A:

Q: A horizontal force of magnitude F = 57.5 N pushes on a block of mass m = 4.7 kg. The block is on a…

A: The given situation can be represented as

Q: A teenager is pushing a cart.  There is no friction between the cart and the ground. Mass of the…

A: 1. First, determine the cart’s constant acceleration (a) during the given time due to the force (F)…

Q: A cart of mass 8.00 kg was moved by applying two constant forces. Force 1 is 28.0 N at 42.0°, and…

A: Since there are multiple sub parts posted, we will answer the first three sub parts. a) The force is…

Q: An electron is a subatomic particle (m = 9.11 x 10-31 kg) that is subject to electric forces. An…

A:

Q: An impala is an African antelope capable of a remarkable vertical leap. In one recorded leap, a 45…

A:

Q: A driver in a 1500-kg car driving at 10.0 m/s gently presses the brakes momentarily. The brakes…

A:

Q: The figure shows two blocks connected by a cord (of negligible mass) that passes over a frictionless…

A: It is clear from the figure that the block m­2 has more  mass so that it accelerates down ward and…

Q: A flea jumps by exerting a force of 1.32 × 10-5 N straight down on the ground. A breeze blowing on…

A: Given Force exerted by the flea on the ground is Fflea=1.32×10-5 N Force due to the breeze parallel…

Q: The figure shows two blocks connected by a cord (of negligible mass) that passes over a frictionless…

A:

Q: An electron is a subatomic particle (m = 9.11 x 10-31 kg) that is subject to electric forces. An…

A:

Q: An object has a velocity (4.04 m/s)i + (-4.96 m/s)j + (4.44 m/s)k. In a time of 3.84 s its velocity…

A:

Q: You are given two masses, m₁ and m2, strapped on a pulley with a rope. m₁-13 kg and m2-17 kg. What…

A: Given value--- m1 = 13 kg. m2 = 17 kg . so we can see m2 > m1. We have to find--- What is the…

Q: A model rocket is launched up with a thrust of 44.2 N. At one point in its upward flight, the air…

A:

Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”