9303753286127016 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:

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:

 Given

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

Solution

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

10+20V=0

20V=−10

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.

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Balkishan Agrawal

At the helm of GMS Learning is Principal Balkishan Agrawal, a dedicated and experienced educationist. Under his able guidance, our school has flourished academically and has achieved remarkable milestones in various fields. Principal Agrawal’s vision for the school is centered on providing a nurturing environment where every student can thrive, learn, and grow.

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