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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 `

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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 further distance penetrated by the bullet into the block is
A. 2x
B. 4x
C. 6x
D. 8x
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Correct Answer - B
Work-energy theorem , `W = FS cos theta = Delta K.E`
`S alpha K_(f) - K_(i)`.
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