A 50-M Radius Playground Merry-Go-Round with a Moment of Inertia Of Of 2000

Multiple Choice

A 5.0-m radius playground merry-go-round with a moment of inertia of $$2000 \mathrm {~kg} \cdot \mathrm { m } ^ { 2 }$$ is rotating freely with an angular speed of 1.0 rad/s. Two people, each of mass 60 kg, are standing right
Outside the edge of the merry-go-round and suddenly step onto the edge with negligible speed
Relative to the ground. What is the angular speed of the merry-go-round right after the two people
Have stepped on?

A) 0.60 rad/s
B) 0.40 rad/s
C) 0.20 rad/s
D) 0.80 rad/s
E) 0.67 rad/s