Question

A tennis ball (mass 57.0 g) moves toward the player's racquet at 46.4 m/s. It is in contact with the racquet for 3.60 ms, after which it moves in the opposite direction at 49.8 m/s. What is the average force on the ball due to the racquet? (Assume the ball is moving in the positive direction after the contact with the racquet. Indicate the direction with the sign of your answer.)

Answer 1

force*time=mass(Vf-Vi)=mass(49.8+46.4)

figure force, it is in the direction of the final velocity, positive