Question #126467

A person on a bicycle is moving East at 15 m/s on a horizontal road. The total mass of the person plus the bicycle is 9.0 x 101 kg. The person stops pedaling and comes to rest in 12 s. Calculate the average force causing the bicycle to slow down.

I need a free body diagram for the following question

I need a free body diagram for the following question

Expert's answer

Referring to the figure,

There must be some force in opposite direction of motion so that bicycle come to rest.

total Mass, "M = 9*10^1 = 90 kg"

Speed of the motion, "V = 15m\/s"

total time of the motion, "t = 12s"

Then acceleration, (magnitude)

"a = \\frac{V}{t} = \\frac{15}{12} = 1.25m\/s^2"

then Force, "F = Ma = 90*1.25 = 112.5 N"

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