Question

A 150g bullet is fired from 15kg with a speed of 1500mg what is the speed of gun ?

Answer 1

Answer:

Explanation:

Given the mass of the gun, M = 15 kg,  

mass of the bullet, m = 0.15 kg  

Speed of the bullet, v = 1500 m/s.  

Let the velocity of recoil of the gun = V  

Using conservation of momentum, we get  

Momentum after = momentum before  

MV – mv = 0 (as initial momentum was zero)  

or, MV = mv  

or, 15×V = 1500×0.15  

or, V = 225/15 = 15 m/s