A 400-Kg Child Running at 3

Multiple Choice

A 40.0-kg child running at 3.00 m/s suddenly jumps onto a stationary playground merry-go-round at a distance 1.50 m from the axis of rotation of the merry-go-round.The child is traveling tangential to the edge of the merry-go-round just before jumping on.The moment of inertia about its axis of rotation is 600 kg ∙ m² and very little friction at its rotation axis.What is the angular speed of the merry-go-round just after the child has jumped onto it?

A) 0.788 rad/s
B) 0.261 rad/s
C) 6.28 rev/s
D) 2.00 rad/s
E) 3.14 rev/s