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A bullet fired from a gun can pierce thr...

A bullet fired from a gun can pierce through a thick wooden board but the same bullet thrown with a blow of hand can't pierce in the board.

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Because, the velocity v of a bullet fired from the gun is too much. Hence as per `E_(k)propv^(2)`, (`because` m = constant) the kinetic energy `E_(k)` of the bullet is too much. As a result it can pierce through the thick wooden board.
While the velocity v of the bullet thrown by blow of hand is less. Hence as per `E_(k)propv^(2)`, kinetic energy of bullet is less. As a result it cannot pierce in the board.
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