Question
Mon September 03, 2012 By:

acceleration

Expert Reply
Mon September 03, 2012
it is because the bullet is being pushed by the gas pressure in the muzzle so the force on the bullet while it leaves the muzzle gives it an impulse which causes its velocity to increase even outside the muzzle.
You can compare it with a stone thrown by swing of a hand. the velocity of stone keeps on increasing even when it leaves the hand till it is overcome by air resistance.
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