A76 kg bike racer climbs a 1500-m-long section of road that has a slope of 4.3 ∘ . you may want to review ( pages 296 - 298) . part a by how much does his gravitational potential energy change during this climb

The change in potential energy of the bike racer is equal to

where m is the mass of the bike racer, and is the change in altitude of the racer. This corresponds to the height of the ramp, which is long. Therefore the height of the ramp (and the variation of altitude) is

And so, the variation of potential energy of the racer is