A playground merry-go-round has a radius of 9.38 m and it is rotating with an angular velocity of 23.35 rev/s. Its angular velocity slows down to 8.19 rev/s after a 25.155-kg child gets onto it by grabbing its outer edge. The child was initially at rest before he grabs onto the merry-go-round. The moment of inertia of the merry-go-round is 1/2*MR2. What is the mass of the merry-go-round M in unit of kg?

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