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5. A small cube of mass m slides down a circular ramp of radius R cut into a large block of mass M, as
shown. The large block rests on a table, and both blocks move without friction. The blocks are initially
at rest, and the cube starts from the top of the path. Find the speed v of the cube the instant after it has
left the block. [Ans: v =2gR
1 + (m/M)

M
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