A girl of mass M stands on the rim of a ...

A girl of mass `M` stands on the rim of a frictionless merry-go-round of radius `R` and rotational inertia `I` that is not moving. She throws a rock of mass `m` horizontally in a direction that is tangent to the outer edge of the merry-go-round. The speed of the rock, relative to the rock. relative to the ground, is `v`. After, the linear speed of the girl is.
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