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**Trick to learn formula for V1’ and V2’ (veleocities after collision)***
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As shown below, bob A of a pendulum having massless string of length ‘R’ is released from 60° to the vertical. It hits another bob B of half the mass that is at rest on a friction less table in the centre. Assuming elastic collision, the magnitude of the velocity of bob A after the collision will be (take g as acceleration due to gravity)
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