A girl and her bicycle have a total mass of 35 kg. At the top of a hill her speed is5 m/s. The hill is 11 m high and 100 m long. If the force of frictionas she rides down the hill is 15 N,what is her speed at the bottom?

Sinead Mcgee

Sinead Mcgee

Answered question

2021-04-26

A girl and her bicycle have a total mass of 35 kg. At the top of a hill her speed is5 m/s. The hill is 11 m high and 100 m long. If the force of frictionas she rides down the hill is 15 N,what is her speed at the bottom?

Answer & Explanation

bahaistag

bahaistag

Skilled2021-04-28Added 100 answers

Whoever wrote that is very wrong. You need to considerthe total energy she has. At the top she has both KE and PE. Her KE is 12mv2 or 1235(5)2 Plus her PE given amgh or 35×9.8×11. She loses energy on the way down due tofriction in the amount of F×D or 15×100=1500. So to find V final. ADD the KE top plus the PE top and subtract 1500 and that equals 12mv2 (KE only at bottom) You should get 12.4 m/s

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