Alex throws a 0.25-kg rubber ball down onto the floor. The ball's speed just before impact is 4.5 m/s, and just after is 2.9 m/s. What is the change in the magnitude of the ball's momentum?
a. 0.39 kg/m/s
b. 1.9 kg/m/s
c. 1.1 kg/m/s
d. 0.73 kg/m/s
e. 7.4 kg/m/s
b
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