A rifle bullet loses 1/20th of its velocity in passing through a plank.Find the least number of such planks required to just stop the bullet?
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What is the least number of plankd required to stop the bullet . v=0, S=n S 0 u^2 -2 a nSor n=u^2/(2 aS0 = u^2 /( 39u^2 //400) = (400)/(39) = 10.25 ~~ 11`
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