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A particle of mass m moving with horizontal speed 6 m / sec as shown in figure. If M m  then for one dimensional elastic collision, the speed of lighter particle after collision will be

1. 2 m / sec in original direction
2. 2 m / sec opposite to the original direction
3. 4 m / sec opposite to the original direction
4. 4 m / sec in original direction

Correct answer: 2 m / sec in original direction

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