A Merry-Go-Round of Radius R = 2

Multiple Choice

A merry-go-round of radius R = 2.0 m has a moment of inertia I = 250 kg⋅m², and is rotating at 10 rpm. A child whose mass is 25 kg jumps onto the edge of the merry-go-round, heading directly toward the center at 6.0 m/s. The new angular speed (in rpm) of the merry-go-round is approximately

A) 10
B) 9.2
C) 8.5
D) 7.1
E) 6.4