A girl and her bicycle have a total mass of 40 kg. At the top of a hill, that is 10 m high and 100 m long, her speed is 5 m/s. If the force of friction as she rides down the hill is 20 N, what is her speed at the bottom? a) 5 m/s b) 10 m/s c) 11 m/s d) She stops before she reaches the bottom Pretty sure this is a fairly simple question but I keep getting lost when deriving equations.

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