A Merry-Go-Round with a Moment of Inertia of 6 $\times$ 10³ Kg · M² Is Coasting at 2

Multiple Choice

A merry-go-round with a moment of inertia of 6.78 $\times$ 10³ kg · m² is coasting at 2.20 rad/s.When a 72.6-kg man steps onto the rim,the angular velocity decreases to 2.0 rad/s.The radius of the merry-go-round is

A) 3.06 m
B) 3.66 m
C) 4.27 m
D) 4.88 m
E) 5.49 m