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Physical World

Question

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A particle of mass m moving with velocity v collides with a stationary particle of mass 2m. The speed of the system, will be

3v

$\frac{v}{2}$

$\frac{v}{3}$

2v

Solution

C.

$\frac{v}{3}$

According to conservation of momentum

change in moment is eual to final momentum

m₁v₁+m₂v₂= (m₁+m₂)v'

mv+2m×0= (m+2m)v'

so, v'= $\frac{v}{3}$

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