a tennis player receieves a srve with the ball travelling horizontally towards him at 50 m/s: and returns it with the ball going away from him horizontally at 40m/s if the mass of the ball is 100g.
A. what was the change in momentum of the ball
B. if it was in contact with the racquet for 0.1s, what was the average force applied by the racquet on the ball
C. a 50g block moving to the right with a speed of 20cm/s collides with a 10g block moving to the left with a speed of 40cm/s. the collision is inelastic(lump together). what will be the velocity of the combined mass?
D. what percent of intial KE was lost in collision.
E. what happened to this KE.