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2 riders are competing in a 13km time-trial over a course that is flat for the...

2 riders are competing in a 13km time-trial over a course that is flat for the first 10km with the final 3km having an average incline of 6%. Rider 1 has a mass of 70 kg (including his bike) and a specific power output of 5.3 W/kg. Rider 2 has a mass on 85kg (including his bike) and a specific power output of 4.5 W/kg. Assume a constant retarding force of 35N over the length of the course due to rolling resistance, bearing friction and aerodynamic drag.

i) How long does it take each rider (in minutes) to complete the 10km flat section of the course.

ii) How long does it take each rider to complete the 3km incline. iii) Which rider completes the course in the quickest time

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