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A ball of mass 10 kg is moving with a velocity of 10 m/s. It strikes another ball of mass 5 kg which is moving in the same direction with a velocity of 4 m/s. If the collision is elastic, their velocities after the collision will be, respectively

6 m/s, 12 m/s
12 m/s, 6 m/s
12 m/s, 10 m/s
12 m/s, 25 m/s

detailed solution

Correct option is A

v1=m1−m2m1+m2 u1+2m2m1+m2 u2  andv2=2m1m1+m2 u1+m1−m2m1+m2 u2on putting the values v1=6 m/s and v2=12 m/s

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