A child on a freely rotating merry-go-round moves from near, Ask an Expert

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Q. A child on a freely rotating merry-go-round moves from near the center to the edge. Will the rotational velocity of the merry-go-round increase, decrease, or not change at all? Explain.

Q. An unstretched spring with spring constant 17 N/cm is suspended from the ceiling. A 1.7 kg mass is attached to the spring and let fall. To the nearest tenth of a centimeter, how far does it stretch the spring?

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