1. a 4kg bucket is pulled at a constant velocity straight up a 5m well.
a. How much work is done by the puller?
b. How much work is done by the force of gravity on the bucket?
c. How much total work is done?
2. A donkey pulls a 100kg sled for 20m across a level surface.
a. If the rope pulls at a 30° angle to the horizontal with just enought energy
to force to move the sled without acceleration and the coefficient of friction
for the sled/surface is 0.3, how much work does the donkey do?
b. If the donkey does all this in 10 seconds, how much power is it exerting?
