# Moving in a curved surface

Object $$A$$ with a mass of $$M$$ is about to slide down a curved surface from the height of $$h$$ to collide with object $$B$$ at the bottom with a mass of $$2M,$$ as shown above. If the coefficient of restitution between the two objects is $$0.5,$$ then what is the speed of object $$B$$ immediately after the collision? (Ignore air resistance, all frictional forces and the sizes of the objects. $$g$$ denotes gravitational acceleration.)

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