A 185lb hiker with a 50lb backpack hikes from 1 camp at 9,000ft altitude to camp 2 at 13,300ft in 8 hours, How much total work is done due to the change in elevation? 19) For the Hiker in problem 18, How much power, (hp) is expended? 20) How many calories did the hiker in problem 18 burn? 21) The hiker has a buddy (same weight) that made the same hike in 6.0 hours. How much power (hp) was used?