A bullet moving with a speed of 100 ms^(...

A bullet moving with a speed of `100 ms^(-1)` can just penetrate into two planks of equal thickness. Then the number of such planks, if speed is doubled will be .

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The correct Answer is:

Stopping distance `(S) = u^2/(2a) implies S prop u^2`
If speed is doubled then
S. = 4S
Number of plank = 8.

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