- #1

milan.007

- 9

- 0

## Homework Statement

A gun of mass 500Kg fires a shell of mass 2Kg with a muzzle velocity of 500m/s.

Calculate:

i) the velocity of recoil of the gun

ii) the force required to stop the gun in a distance of 0.25m

## Homework Equations

## The Attempt at a Solution

i)I got the velocity of the gun by using the principal of conservation of momentum:

(500)(0) + (2)(0) = 500v + (500)(2). I got 2m/s.

ii)First i used v=d/t, 2=0.25/t, I got 0.125 seconds.

Then i used Force = change in momentum/time taken.

I get 8000N but the book says 4000N.

Im not sure what I am doing wrong??