3. A car traveling 45 km/h slows down at a constant 0.50 m/s just by "letting up on the gas." Calculate the following: a. The distance the car coasts before it stops. b. The time it takes to stop. c. The distance it travels during the first second and during the fifth second of coasting.
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- 1. A train leaves the station on a 50 km commute. The train must make a 60-second stopevery 1.0 km to pick up and drop off passengers. The train accelerates at 2.0 m/s2, then cruises at90 km/h, and then decelerates at 5.0 m/s2 between stops.(a.} How many stops does the train make?(b.} How long does it take for the train to get from one stop to the next?(c.} What is the total time for the entire commute?1. Rushin is waiting at a stoplight. When it finally turns green, Rushin accelerated from rest at a rate of a 2.00 m/s² for a time of 15 seconds. Determine the velocity of Rushin's car during this time period. -30 m/s? с. 7.5 m/s a. b. 30 m/s? d. 30 m/s 2. Ima is approaching a stoplight moving with a velocity of +30.0 m/s. The light turns yellow, and Ima applies the brakes and skids to a stop. If Ima has an acceleration rate of 8.00 m/s², determine the displacement of the car during the skidding process. 56.3 m cannot determine a. с. b. 240 m d. 4.3 m 3. A car slows down uniformly from a speed of 21.0 m/s to rest in 6.00 seconds. What was its average velocity? How far did it travel in that time? 10.5 m/s; 0.29 m 10.5 m/s; 63 m b. 21.0 m/s ;126 m a. с. d. cannot determine6. A futsal player leaves the bench and runs 5.0 m [N] and then 4.0 m [W] where she stops after 9 seconds. Gi a. what is the total distance traveled b. what is the displacement of the player c. what is her average speed d. what is her average velocity
- 2. A car is traveling down a long, straight road at 15 m/s (about 25 mph) when the driver sees an obstacle and brakes to a stop at a rate of 10 m/s² (magnitude). A typical driver has a reaction time of 0.5 s, that is it takes them this long after seeing the obstacle before they apply the brakes. 1. What is the minimum stopping distance for the above driver? 2. What would be the minimum stopping distance if the driver is initially traveling at 30 m/s instead of 15 m/s?3. Jakub is driving at 25.0 m/s when he sees the speed limit so he slows down (decelerates) at -4.0 m/s2 for 4.0 seconds. a. Calculate Jakub's final speed. Ax D V = V=1. A car traveling 75 km/h slows down at a constant acceleration of 0.50 m/s^2 just by “letting up on the gas.” Calculate (a) the distance the car coasts before it stops, (b) the time it takes to stop. 2. A horse trots away from its trainer in a straight line, moving 38 m away in 9.0 s. It then turns abruptly and gallops halfway back in 1.8 s. Calculate (a) its average speed and (b) its average velocity for the entire trip, using “away from the trainer” as the positive direction. 3. At highway speeds, a particular automobile is capable of an acceleration of about 1.8 m/s^2. At this rate, how long does it take to accelerate from 65 km/h to 120 km/h? 4. In coming to a stop, a car leaves skid marks 65 m long on the highway. Assuming a deceleration of 4.00 m/s^2, estimate the speed of the car just before breaking. 5. A baseball is hit almost straight up into the air with a speed of 25 m/s. Estimate (a) how high it goes, (b) how long it is in the air.
- 2. A jet plane has a takeoff speed of vtakeoff = 73 m/s and can move along the runway at an average acceleration of 2.4 m/s2. The runway is 1.2 km. Write out the 3 Kinetic equations. a. b. Write out the values of initial position, initial velocity, and acceleration. How many seconds will it take for the plane to reach takeoff speed? с. d. How far will the plane have to travel to get to takeoff speed? will the plane be able to get to take off before it gets to the end of the runway? е.1. You are driving at 8.00 m/s south. You accelerate uniformly at 1.10 m/s? north for 5.00 seconds. How fast are you going at the end of the 5.00 seconds? What is your displacement?9. A car with its brakes applied has an acceleration of -1.2 m/s˄2. If its initial velocity is 10 m/s, the distance the car covers in the first 5 seconds after the acceleration begins is A. 15 m B. 32 m C. 35 m D. 47 m 12. A train starting at 30 km/h travels a distance of 21 km in 18 min. Determine the acceleration of the train at this instant. A. 0.0865 m/s˄2 B. 0.0206 m/s˄2 C. 0.3820 m/s˄2 D. 0.0043 m/s˄2 13A stone is dropped from a cliff. After it has fallen 30 m, the magnitude of its velocity is approximately A. 17 m/s B. 24 m/s C. 44 m/s D. 588 m/s Answer the following, i only need the letter of correct answer.
- 2. Two cars are drag racing. The red car accelerates at a rate of 4.7 m/s', and the blue car at a rate of 3.9 m/s’. The blue car starts 1.5 s before the red. Find the time it takes for the red car to be at the same position as the blue car, how the cars have traveled, and how fast each is moving at this time.A car is moving along a straight road with an initial velocity of v, =13 m/s and an acceleration, a=2 m/s2. What is the distance traveled (in m) after t=4 s? A. None B. 204 C. 136 D. 68 E. 272 OUOD O8. The speeds of a car and a truck were 75 km/h and 50 km/h respectively. They left town A at the same time for town B. The car passed an oncoming van 6 hours later. 1.5 hours after that, the truck and the same van passed each other. Find the speed of the van. a. 30 km/h b. 40 km/h c. 50 km/h d. 60 km/h c. 70 km/h