Two spheres A and B moving in opposite directions have velocities of 10ms-1 and 20ms-1. The two spheres collide with each other elastically. If A continues to move in the same direction at 4 ms-1, the velocity of sphere B just after the collision is

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34 m/s in the same direction of A

34 m/s in the opposite direction of A

26 m/s in the same direction of A

26 m/s in the opposite direction of A

answer is A.

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Detailed Solution

v2 - v1 =u1 - u2v2 - 4 =10 +20 ⇒ v2 = 34 m/s

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