A 0.10-kg ball is moving at 7.0 m/s when it is hit by a bat,causing it to reverse direction and have a speed of 12.0 m/s.What is the change in the magnitude of the momentum of the ball?
A)0.50 kg⋅m/s
B)5.0 kg⋅m/s
C)0.70 kg⋅m/s
D)1.9 kg⋅m/s
E)1.2 kg⋅m/s

Question

Quizplus · Accepted Answer

The change in momentum is calculated as the final momentum minus the initial momentum. The initial momentum is (0.10 kg)(7.0 m/s) = 0.70 kg⋅m/s. The final momentum is (0.10 kg)(12.0 m/s) = 1.20 kg⋅m/s. The change in magnitude is |1.20 - (-0.70)| = 1.90 kg⋅m/s.

A 010-Kg Ball Is Moving at 7