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OpenStudy (anonymous):
The head of a 1 kg hammer, moving at 3.6 m/s, strikes a nail and drives it into hardwood. a) The head stays in contact 2.0 ms and rebounds with negligible velocity. What is the average force exerted on the nail? b) When the same hammer hits a springy nail, it rebounds with its initial speed, 3.6 m/s. The contact time is the same. What force is exerted this time?
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