A merry-go-round is a common piece of playground equipment. A 3.0-m-diameter merry-go-round with a mass of 250 {rm kg} is spinning at 20 {rm rpm}. John runs tangent to the merry-go-round at 5.0 {rm m/s}, in the same direction that it is turning, and jumps onto the outer edge. John's mass is 30 {rm kg}.