As shown below, bob A of a pendulum having massless string of length ' R ' is released from 
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 
as acceleration due to gravity)
Text Solution
Verified by ExpertsA
Velocity of a just before hitting :
Just after collision, let velocity of 
and 
are 
and 
respectively
by COM:
From (i) -(ii)
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