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