1. A 1kg ball with velocity 20m/s bounces perpendicularly off a wall so it has the similar speed afterward if the average force is20000N then how long in milliseconds did the collision take?
a) 1000 ms b) 10 ms c) 5 ms d) 2ms
2. A .5 kg ball, traveling 20 m/s, is struck by a bat, imparting an impulse of 50 Ns in the opposite direction. Discover the speed of the ball after being struck.
a) 50m/s b) 20 m/s c) 30 m/s d) 80 m/s