a bullet moving with a velocity of 100 m/s can just penetrate two planks of equal thickness. the number of such planks penetrate by the same bullet, when the velocity is doubled, will be..................
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A bullet moving with a speed of 100ms-1 can just penetrate into two planks of equal thickness. Then the number of such planks, if speed is doubled will be . if v is doubled, n will become four times.
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