Amy and Josh are coasting on their bicycles down a 10 degree slop at 15 m/s thro

Question

Amy and Josh are coasting on their bicycles down a 10 degree slop at 15 m/s through still air. The mass of Amy and her bicycle is 60 kg. The mass of Josh and his bicylce is 90 kg. The cross-sectional are of Amy and her bicycle is 0.45, while the cross-sectional area of Josh and his bicycle is 0.60. The drag coefficient for both cyclists is 0.70. Other than gravity and air resistance, the external forces acting on the two bicycle and rider systems are the same. Which cyclist is more affected by air resistance?

Explanation / Answer

retardation of amy due to resistance is proportional to ... area / mass = 0.45 / 60 = 0.0075

retardation of josh due to resistance is proportional to ... area / mass = 0.60 / 90 = 0.006667

so... as amy will have more retardation so.. it will be more affected

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