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Q.

A marble going at a speed of 2 ms-1 hits another marble of equal mass at rest. If the collision is perfectly elastic, then the velocity of the first marble after collision is

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a

2ms-1

b

0ms-1

c

3ms-1

d

4ms-1

answer is B.

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v1→=m1-m2m1+m2u1→+2m2m1+m2u2→

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