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If you take a rifle and saw off part of the barrel, explain what happens to the speed at which bullets emerge from the barrel. Note: Sawing the barrel doesn't affect the amount of gunpowder in the cartridge nor does it significantly reduce friction.

Multiple Choice

The speed increases slightly due to less friction in the shorter barrel.

The speed remains the same as the trigger mechanism determines the bullet speed.

The speed decreases due to less propellant gas acting on the bullet.

The speed decreases since a shorter barrel produces a shorter time interval over which the bullet is accelerated by the firing force