Question

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

Answer 1

Answer: (B)

Decreases but does not become zero

Answer 2

By momentum conservation before and after collision.

$m _ { 1 } V + m _ { 2 } \times 0 = \left( m _ { 1 } + m _ { 2 } \right) v$ ⇒ $v = \frac { m _ { 1 } } { m _ { 1 } + m _ { 2 } } V$

i.e. Velocity of system is less than V.