# Physics rifle problem -- Forces and acceleration of the bullet

## Homework Statement

A rifle bullet of mass 10g is fired and takes 2.0 ms to travel down the rifle barrel of length 0.50m with constant acceleration

1. Calculate the muzzle velocity (bullet velocity on leaving the barrel)
2. Calculate the acceleration in the barrel
3. After travelling a short distance through air, the resistance of which can be neglected, the bullet hits a target and penetrated to a depth of 2.5 cm. Calculate the average force acting on of the bullet while it is coming to rest.

## The Attempt at a Solution

m=10 t=2ms=0.002 s l=0.5 m

1. I dont know this one but I need it to get the other answers
2. a = 0-v/0.002 Then use v that I get in 1)?
3. Do I just use F = ma here? after getting a in 2)

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## Answers and Replies

Orodruin
Staff Emeritus
Science Advisor
Homework Helper
Gold Member
I suggest you look up and study the suvat equations. They are basic kinematic relations for motion with constant acceleration.