First slide

Collisions

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

Moderate

A

$v / 2$
B

2v
C

$v / 3$
D

3v

Solution

Initial momentum = $mv$
Final momentum = $3 mV$
By the law of conservation of momentum $mv = 3 mV$
$∴ V = v /3$

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