A bullet travelling with a velocity of 16 m/s penetrates a tree trunk and comes to rest in 0.4m. find time ( in seconds)taken during the retardation

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0.02

0.04

0.05

0.06

answer is C.

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Detailed Solution

given initial velocity =u=16m/s; final velocity =v=0;displacement=s=0.4m acceleration =a=v2−u22s=02−1622×0.4=−320m/s2 Time t=v−ua=0−16−320=0.05sec

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