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
◦ 10
◦ 9.2
◦ 8.5
◦ 7.1
◦ 6.4