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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Physics