## The barrel of a rifle has a length of 0.955 m. A bullet leaves the muzzle of a rifle with a speed?

Question

The barrel of a rifle has a length of 0.955 m. A

bullet leaves the muzzle of a rifle with a speed

of 615 m/s.

What is the acceleration of the bullet while

in the barrel? A bullet in a rifle barrel does

not have constant acceleration, but constant

acceleration is to be assumed for this problem.

Answer in units of m/s2

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General Physics
4 years
1 Answer
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## Answer ( 1 )

If the acceleration were constant, the average speed of the bullet during the time while it was in the barrel would have been 307.5 m/s. The time was therefore (0.955 m)/(307.5 m/s) = 0.0031057 seconds, and the acceleration was

(615 m/s)/(0.0031057 s) = 198000 m/s^2.