A bullet travellling with a velocity of 16 m/s penetrates a tree trunk and comes to rest in 0.4 m. Find the time taken during the retardation.

A bullet travellling with a velocity of 16 m/s penetrates a tree trunk

1.	A bullet travellling with a velocity of 16 m/s penetrates a tree trunk and comes to rest in 0.4 m. Find the time taken during the retardation.
Answer» `u=16m/s (initial) v=0 S=0.4m Deceleration a= (v^2-u^2)/(2S) (0-16^2)/(2xx0.4) =320m/s^2 time= (v-u)/a= (0-16).(-320) =0.05 sec`

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A bullet travellling with a velocity of 16 m/s penetrates a tree trunk and comes to rest in 0.4 m. Find the time taken during the retardation.

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