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a bullet incident normally on a wooden plank , loses 1/10 th of its speed in passing through the plank . the least number of such planks required to stop the bullet is _____ . a. 5 6 7 8
Writing direct for n planks,0^2 = v^2+ 2andorn = -v^2/2ad.........(1) Now to pass through one plank,the final velocity becomes,v – v/10 = 9v/10 m/s.therfore,(9v/10)^2 = v^2 + 2ad................(2)put value of 2ad in eqn. (1) and get the value of n.
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