A bullet of mass 100 g is fired from a gun of mass 20 kg with a velocity of 100ms −1. Calculate the velocity of recoil of the gun:


Mass of bullet =m=100g=100 /1000kg=1/10kg

Velocity of bullet, v=100ms-1

Mass of gun, M=20kg

Find out

We have to determine the velocity of recoil of the gun


Let us assume the recoil velocity of the guns as V

Before firing,

The system (gun+bullet) is at rest, therefore, initial momentum of the system =0
Final momentum of the system = momentum of bullet + momentum of gun

mv+MV = 1/10 X 100 + 20 V= 10 +20 V

On applying law of conservation of momentum,

Final momentum = Initial momentum



V=− 10/20 = 0.5ms-1

Negative sign indicates that the direction of recoil velocity of the gun is opposite to the direction of the velocity of the bullet.

Articles to explore

Getting Info...
Cookie Consent
We serve cookies on this site to analyze traffic, remember your preferences, and optimize your experience.
It seems there is something wrong with your internet connection. Please connect to the internet and start browsing again.
AdBlock Detected!
We have detected that you are using adblocking plugin in your browser.
The revenue we earn by the advertisements is used to manage this website, we request you to whitelist our website in your adblocking plugin.
Site is Blocked
Sorry! This site is not available in your country.