A body of mass `4kg` moving with a speed of `3 ms^(-1)` collides head on with a body of mass `3 kg` moving in the opposite direction at a speed of `2 ms^(-1)`. The first body stops after the collision. The final velocity of the second body is

Options

A. `3 ms^(-1)`
B. `5 ms^(-1)`
C. `-9 ms^(-1)`
D. `30 ms^(-1)`

Answer

A

Explanation

`m_(1)u_(1) - m_(2)u_(2) = m_(1)v_(1) + m_(1)v_(2)`.