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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)=2mv
v=22.5m/s

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