Answer to Question #126467 in Mechanics | Relativity for Sara

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
1
Expert's answer
2020-07-17T09:14:43-0400

Referring to the figure,

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

total Mass, M=9101=90kgM = 9*10^1 = 90 kg

Speed of the motion, V=15m/sV = 15m/s

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

Then acceleration, (magnitude)

a=Vt=1512=1.25m/s2a = \frac{V}{t} = \frac{15}{12} = 1.25m/s^2

then Force, F=Ma=901.25=112.5NF = Ma = 90*1.25 = 112.5 N




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