Just before a bouncy ball hits a wall, it is traveling parallel to the ground at 18 m/s, and it then bounces directly backwards at 17 m/s. The interaction time with the wall was 0.40 ms (4.0 x 10-4 s). If the ball's mass is 0.17 kg, what is the average magnitude of the force of the wall on the ball during their interaction? A. 7700 N B. ON C. 7200 N D. 15000 N O A B

Two toy cars are about to collide! B A Car A has a mass of 450 g and is travelling at 2.25 m s-1. Car B has a mass of 350 g and is travelling in the opposite direction at 2.75 ms-1. (Define left to be the positive x-direction.) Unless directed in this question, do not round your answers.

9. A 2500 kg truck moving at 10.00 m/s strikes a car waiting at a traffic light, hooking bumpers. The two continue to move together at 7.00 m/s. What was the mass of the struck car? A. 1730 kg B. 1550 kg C. 1200 kg D. 1070 kg E. 967 kg

A young 47 kg ice hockey goalie, originally at rest, deflects a 0.155 kg hockey puck slapped at him at a speed of 36.5 m/s. In this problem, take the original direction of the puck as positive. a. Suppose the goalie and the hockey puck have an elastic collision and the puck is reflected back in the direction from which it came. What would the final velocity of the puck, in meters per second, be in this case?  b. Suppose the goalie and the hockey puck have an elastic collision and the puck is reflected back in the direction from which it came. What would the final velocity, in meters per second, of the goalie be in this case?