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Question

Two balls of masses 1 kg and 2 kg moves towards each other. If they come to rest after colliding, then what was the speed of 1 kg ball before collision?

Speed of the 2 kg ball before collision was 8 m/s.

A
4 m/s
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B
16 m/s
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C
8 m/s
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D
20 m/s
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Solution

The correct option is B 16 m/s
As there is no external forces acting on the system of two balls, on applying Law of Conservation of Linear Momentum, we get,

m1u1+m2u2=m1v1+m2v2

1×u1+2×(8)=1×0+2×0

u1=16 m/s

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