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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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