let mmm - total mass of cyclist and bicycle
vvv - given speed from which she is slowing down
lll - distance when she is slowing down
we need to determine average resistance μ\muμ
from the conservation law of energy: mv22=μmgl{\frac {mv^2} 2}=\mu mgl2mv2=μmgl
then μ=v22gl\mu= {\frac {v^2} {2gl}}μ=2glv2
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