1. The problem statement, all variables and given/known data A bicyclist of mass 65kg (including the bicycle) can coast down a 6 degree hill at steady speed of 6km/h because of air resistance. How much force must be applied to climb the hill at the same speed and same air resistance? 3. The attempt at a solution since it is at constant speed. the net force is zero. therefore the Fg (force due to mg) - Fr (air resistance force) = 0 (mg sin 6) - Fr = 0 Fr= mg sin 6 = 66.58N. For it to climb back the hill at the same speed and same air restance? the bicyclist have to tackle the two same force now = 66.58 + mg sin 6 = 133N. The model answer given is 130N.....but i got 133N... any mistake i have made?