Question

A cyclist coasts down a 7.2 degree hill at a steady speed of 10km/h. If the total mass of the bike and rider is 75kg, what power output must the rider have to climb up the hill at the same speed?

Answer 1

Dont they have formula for this?

Answer 2

Power = E/t

Answer 3

i've tried doing this problem, but I can't get the same answer as in the back of the book, and another issue is that i wonder if the mass of the rider climbing up the hill is the same as the initial mass.