There is a merry-go-round in a playground of mass 200 kg and radius 1.5m.

1. Child A (m=40 kg) runs with speed 2m/s tangentially to the merry-go-round and jumps on the edge of the disk. The velocity of the child was perpendicular to the radius at the point of jumping. What happens?
2. Child B (m=40kg) runs with speed 2m/s directly at the center of the platform and then jumps on. What happens?