A bullet moving with a speed of 100 ms−1can just penetrate two planks of equal thickness. Then, the number of such planks penetrated by the same bullet when the speed is doubled will be

Question : A bullet moving with a speed of 100 ms−1can just penetrate two planks of equal thickness. Then, the number of such planks penetrated by the same bullet when the speed is doubled will be

(A) 6

(B) 10

(C) 4

(D) 8

Answer : option (D)

Solution :

A bullet moving with a speed of 100 ms−1can just penetrate two planks of equal thickness. Then, the number of such planks penetrated by the same bullet when the speed is doubled will be
A bullet moving with a speed of 100 ms−1can just penetrate two planks of equal thickness. Then, the number of such planks penetrated by the same bullet when the speed is doubled will be
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