A bullet travelling with a velocity of 12 m/s penetrates a tree trunk and comes to rest in 0.3 sec.Find the time taken during the retardation.
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The distance after which the bullet comes to rest is 0.4m. The initial velocity of the bullet is 16m/s. 0=16^2+2×a×0.4 (v=0, cause the bullet comes to rest.) Therefore, the time taken is 0.5s.
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