A bullet is fired normally towards an im...

A bullet is fired normally towards an immovable wooden block. If it loses `25 %` of its kinetic energy in penetrating through the block at thickness `x`, the distance penetrated by the bullet into the block is

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The correct Answer is:

`-Fx=-0.25 K`
`-Fx_(0)=-K`
`:. x_(0)=4x`

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