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JM13.A bullet moving at 35m/s penetrates 2.8m in a wooden plank and comes to rest.Assuming uniform retardation, find the time of penetration of the bullet.a) 0.16 sb) 1.6 sc) 0.08d) 0.8

Answer»

Usingv = u + at0 = 35 + a*tat = - 35a = - 35/t........ (1)

Now,Usings = ut + 1/2 at^2Put value of a from eq(1)2.8 = 35t + 1/2 * (-35/t) * t^22.8 = 35t - 35/2 t2.8 * 2 = 35 tt = 2.8 * 2/35 =.8/5t = 16/100 = .16 sec

(a) is correct option



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