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Two identical balls A and B having velocities of 0.5 m / s and –0.3 m / s respectively collide elastically in one dimension. The velocities of B and A after the collision respectively will be

0.3 m / s and 0.5 m / s
– 0.5 m / s and 0.3 m / s
0.5 m / s and – 0.3 m / s
– 0.3 m / s and 0.5 m / s
Explanation:
Mass of balls are same and the collision is perfectly elastic, so their velocity will be interchanged.
So, VA = – 0.3 m / s, VB = 0.5 m / s
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