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Conservation of Momentum

Two identical...

Question

Two identical balls moving in opposite direction with speeds $20 m / s$ and $25 m / s$ undergo head on perfectly inelastic collision. The speed of combined mass after collision is :

A

20 m / s

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B

22.5 m / s

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C

25 m / s

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D

2.5 m / s

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Solution

The correct option is B $22.5 m / s$
By conservation of momentum
$m (20) + m (25) = 2 m v$
$v = 22.5 m / s$

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