A Playground Merry-Go-Round Has a Radius R and a Rotational

Multiple Choice

A playground merry-go-round has a radius R and a rotational inertia I.When the merry-go-round is at rest, a child with mass m runs with speed v along a line tangent to the rim and jumps on.The angular velocity of the merry-go-round is then:

A) mv/I
B) v/R
C) mRv/I
D) 2mRv/I
E) mRv/(mR² + I)