Question

A 2.0-g particle moving at 5.2 m/s makes a perfectly elastic head-on collision with a resting 1.0-g object.

(a) Find the speed of each particle after the collision
2.0g particle:
1.0g particle:

(b) Find the speed of each particle after the collision if the stationary particle has a mass of 10 g.
2.0g particle:
10.0g particle:

(c) Find the final kinetic energy of the incident 2.0-g particle in the situations described in parts (a) and (b).
KE in part a:
KE in part b:

A tennis player receives a shot with the ball (0.0600 kg) traveling horizontally at 50.2 m/s and returns the shot with the ball traveling horizontally at 36.0 m/s in the opposite direction. (Take the direction of the ball's final velocity (toward the net) to be the +x-direction.)I also have another question:

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

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

Answer 1