29 A 30 kg child rides on a playground merry-go-round, 1.4 m from the center. The merry-go-round makes one c volution every 5 s. How large is the net force on the child? In what direction does the net force act?

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!