Question

A gun of mass 5 kg a 50 g bullet with a velocity of 200 m/s. The recoil velocity of the gun is:

• A. 2 m/s
• B. 20 m/s
• C. 0.2 m/s
• D. zero

Answer 1

Answer: (A)

2 m/s

Let mass and velocity of ball be $m1=0.05kg$ and velocity $v1=200m/s.$

Let mass of gun be $m2=5kg$ and recoil velocity be $v2$

Use conservation of momentum.

$m1v1=m2v2$

$\left(0.05\right)\times \left(200\right)=\left(5\right)v2$

$V2=2m/s.$

Hence,

option $A$ is correct answer.