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A 70 kg bicyclist rides his 7.8 kg bicycle with a speed of 14 m/s. How much work must be done by the brakes to bring the bike and rider to a stop?

A 70 kg bicyclist rides his 7.8 kg bicycle with a speed of 14 m/s. How much work must be done by the brakes to bring the bike and rider to a stop?
How far does the bicycle travel if it takes 3.5 s to come to rest?

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