How much work does a 92.5-kilogram man do as he climbs a ladder from a height of 2.3 meters to a height of 7.6 meters?
+37146 It looks like there are THREE very similar qiestions related to potential energy and work posted this morning. I'll show you how to do this one...you should be able to multiply hte others w/out much difficulty. When an object has a CHANGE in potential energy and equivalent amount of work ahs to be done to change this potential energy.....so for THIS problem there is a CHANGE in potential energy as the man is raised from 2.3 to 7.6 meters:
Potential Energy (in joules) = U = mgh m = mass in kg g = gravitational constant 9.8 m/sec^2 h = change in height in meters
92.5 kg man h = 7.6-2.3 = 5.3 meters 92.5 (9.8) (5.3) = potential enrgy change (work done) = 4804.45 j
