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A skilled gunman always keeps his gun sl...

A skilled gunman always keeps his gun slightly tilted above the line of sight while shooting. Why?

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When a bullet is fired from a gun with its barrel directly along the line of sight to the target , it start falling downwards due to acceleration due to gravity . As a result, the bullet below the target . To avoid it the barrel of the gun is tilted little above the line of sight so that the bullet follows a parabolic path after shooting and hits the target .
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