[填空题]
A 4.2-m-diameter merry-go-round is rotating freely wi3appfkm5rsh xg+*,ri+bnnq4 . t )le+th an angular velocity of + ) 301harvszhil1eax 0.svra1+hi )h zx01a3le8 $rad/s$ Its total moment of inertia is 1760 $kg \cdot m^2$ Four people standing on the ground, each of mass 65 kg, suddenly step onto the edge of the merry-go-round. What is the angular velocity of the merry-go-round now? $rad/s$ What if the people were on it initially and then jumped off in a radial direction (relative to the merry-go-round)? $rad/s$
