Answers

2015-09-28T18:13:00+05:30
Because bullet have internal force .  When a bullet leaves the barrel of a gun, it is under explosive acceleration. It is compelled to spin due to spiral grooves cut into the gun barrel, which provide stability and direction during the first 3 to 6 seconds of flight. 
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2015-09-28T18:32:22+05:30
Because it is thrown on a high speed
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