A solid disk rolls along a flat plane at a constant speed of 4 m/s. It then climbs a ramp with an angle of 20 deg. How high up the ramp does the disk roll? 2).A 40 kg child is playing on a merry-go-round (Radius 2 m, Mass 200 kg). When the child is at the edge of the merry-go-round, its angular speed is 2 rad/s. When the child moves to the center, how fast is the merry-go-round spinning (in rad/s).