Your job is to lift 25 kilogram crates a vertical distance of 0.70 meter from the ground onto the bed of a truck.
(a) Determine how many crates would you have to load onto the truck in 1 minute for the average power output you use to lift the crates to equal 0.50 hp?
(b) Determine how many crates would you have to load onto the truck in 1 minute for an average power output of 150 W?