[Nicolas Sanchez]

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The diagram shows the forces acting on a cyclist as she accelerates at 4.0 m s–2
on a straight, horizontal section of road. The constant resistive forces are air resistance and a 300 N force due to friction.

[see diagram below]

The combined mass of the cyclist and bicycle is 50 kg.
What is the value of the air resistance?

A. 50N
B. 100N
C. 200N
D. 300N
E. 450N

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Discussion

[Paris]

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First make sure to draw the forces on paper. This way you can see that the solution is simply given via the equation F=m*a since we know all the forces but one, the mass and the acceleration.

The answer is B.