The barrel of a rifle has a length of 0.898 m. A bullet leaves the muzzle of a rifle with a speed of 616 m/s. What is the acceleration of the bullet

The barrel of a rifle has a length of 0.898 m. Abullet leaves the muzzle of a rifle with a speedof 616 m/s.What is the acceleration of the bullet whilein the barrel? A bullet in a rifle barrel doesnot have constant acceleration, but constantacceleration is to be assumed for this problem.Answer in units of m/s2.