Question

A tennis player receives a shot with the ball (0.0600 kg) traveling horizontally at 60.0 m/s and returns the shot with the ball traveling horizontally at 34.0 m/s in the opposite direction. (Take the direction of the ball's final velocity (toward the net) to be the +x-direction.)

(a) What is the impulse delivered to the ball by the racket?

magnitude	N · s
direction	---Select--- +x −x

(b) What work does the racket do on the ball? (Indicate the direction with the sign of your answer.)
J

Answer 1

Solution a:

We have,
Mass of ball
Initial velocity
Final velocity

Impulse is given by:

Therefore, 5.64 Ns impulse delivered to the ball by the racket.

Solution b:

Work done is given by:

Therefore, -73.32 J work racket does on the ball.