Q. A body of mass $m_{1}$ is moving with a velocity $V$. It collides with another stationary body of mass $m_{2}$. They get embedded. At the point of collision, the velocity of the system
A) Increases
B) Decreases but does not become zero
C) Remains same
D) Become zero
Explanation
(b) By momentum conservation before and after collision
$m_{1}V + m_{2} \times 0 = \left( m_{1} + m_{2} \right)v \Rightarrow v = \frac{m_{1}}{m_{1} + m_{2}}V$
$i.e.$ Velocity of system is less than $V$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.