Question

A tennis player receives a shot with the ball (0.0600 kg) traveling horizontally at 56.0 m/s and returns the shot with the ball traveling horizontally at 44.0 m/s in the opposite direction. What is the impulse delivered to the ball by the racket?
It equals the change in momentum. Since the direction changes 180 degrees, you add the initial and final momentum magnitudes.

Impulse = (0.06)(56 + 44)

Keep three significant figures.

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