# Physics

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A 21-kg child swings on a playground swing 3.4 m long. What is the period of her motion? If her brother, who weighs twice as much as she does,rides on the swing instead, what is the period of the motion?

• Physics -

I'm sure your text or class notes has the pendulum period (P) formula

P = 2 pi sqrt (L/g)

Note that it is independent of mass.

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