Two identical balls “A” and “B” having velocities of 0.5 ms-1 and -0.3 ms-1 respectively collide elastically in one dimension. The velocities of B and A after the collision respectively will be

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-0.5 m s-1and 0.3 m s-1

0.5 m s-1and- 0.3 m s-1

-0.3 m s-1and 0.5 m s-1

0.3 m s-1and 0.5 m s-1

answer is C.

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Detailed Solution

Masses of the balls are same and collision is elastic, so their velocity will be interchanged after collision.∴vA=+uB=-0.3 m s-1and vB=uA=0.5 m s-1

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