The muzzle velocity of a gun is the velocity of the bullet when it leaves the barrel. Th muzzle velocity of 1 rifle with a short barrel is greater than the muzzle velocity of another rifle that has a longer barrel. In which riffle is the acceleration of the bullet larger?

Don't know where to start... :confused:

The bullets start at a velocity of zero (before being fired). They accelerate to a given velocity over a distance. Assuming that the time to leave the barrels is more or less the same, to accelerate to a higher velocity requires a higher acceleration than to accelerate to the lower velocity.