Question

A 0.0420-kg hollow racquetball with an initial speed of 18.3 m/s collides with a backboard. It rebounds with a speed of 7.4 m/s.
Calculate the total impulse on the ball.

Answer 1

if initial speed in +x direction

impulse = change of momentum

.0420 (-7.4 - 18.3)

Answer 2

-10.8 is the impulse