A 400-Kg Child Running at 3 $600 \mathrm {~kg} \cdot \mathrm { m } ^ { 2 }$

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 $600 \mathrm {~kg} \cdot \mathrm { m } ^ { 2 }$ 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) 0.261 rad/s
B) 3.14 rev/s
C) 2.00 rad/s
D) 6.28 rev/s
E) 0.788 rad/s