A moving body of mass m and velocity 3 km/h collides with a body at rest of mass

Discussion Forum : Work Power And Energy

Question -

A moving body of mass m and velocity 3 km/h collides with a body at rest of mass 2m and sticks to it. Now the combined mass starts to move. What will be the combined velocity

Options:

A . 3 km/h

B . 2 km/h

C . 1 km/h

D . 4 km/h

Answer: Option C
:
C

Initial momentum = $m \times 3 + 2 m \times 0 = 3 m$

Final momentum = $3 m \times V$

By the law of conservation of momentum

$3 m = 3 m \times V \Rightarrow V = 1 k m / h$

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