[填空题]
A 4.2-m-diameter merry-go-round is rotati0 ym;9n l*0yt26 fu cchtjf;jwng freely with an an-;y jkp0*rhvzuh*w u, gular velocity of 0.8 -0 *y*z ,kvhjwhu;urp $rad/s$ 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)? $rad/s$
