JEE Main 29 Jan 2025 Shift 1 Paper

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 frictionless table in the center. Assuming elastic collision, the magnitude of the velocity of bob A after the collision will be (take g as acceleration due to gravity.)