Answer to Question #108424 in Mechanics | Relativity for Cece

Question #108424
A cyclist knows the total mass of her self and her bicycle. She also knows how far she can coast when slowing down from a given speed. How could she use this information to determine the average resistance opposing her motion?
1
Expert's answer
2020-04-08T10:53:35-0400

let mm - total mass of cyclist and bicycle

vv - given speed from which she is slowing down

ll - distance when she is slowing down

we need to determine average resistance μ\mu


from the conservation law of energy: mv22=μmgl{\frac {mv^2} 2}=\mu mgl

then μ=v22gl\mu= {\frac {v^2} {2gl}}


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