The head of a hammer (m = 1.5 kg) moving at 4.5 m/s strikes a nail and bounces back with the same speed after an elastic collision lasting 0.075 s. What is the magnitude of the average force the hammer exerts on the nail?
A) 6.8 N
B) 60 N
C) 90 N
D) 180 N
E) 240 N
Correct Answer:
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