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Linear Momentum

A particle of...

Question

A particle of mass m moving with velocity v strikes a stationary particle of mass 2m and sticks to it. The speed of the system will be

A

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B

2v

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C

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D

3v

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Solution

The correct option is C

Initial momentum = $m v$

Final momentum = $3 m V$

By the law of conservation of momentum

$m v = 3 m V$

$∴ V = \frac{v}{3}$

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