JEE Main 202529 Jan, Morning shiftPhysicsMediumWork, Energy and Power70× since 2002
As shown below, bob A of a pendulum having massless string of length '' 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 center. Assuming elastic collision, the magnitude of the velocity of bob A after the collision will be (take as acceleration due to gravity.)