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Q.

A hammer of mass 2kg  strikes on the head of a nail with a velocity of 1ms−1 . It drives the nail 0.01m  into a wooden block. Find the force applied by the hammer and the time of impact

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a

200N;10−2sec .

b

100N;2×10−2sec

c

300N;10−2sec

d

400N;10−3sec

answer is B.

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Detailed Solution

F=−mu22s=−2×12×0.01=−100N a=−1002=−50 V = u + at0=1−50t⇒t=150=0.02 s
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