A man lifts a 13 kg crate directly upwards from the floor to a shelf (6 m high) at constant speed*. (*Neglect the very start and very end of the lift, where the crate would of course need to be accelerated from/to rest.)
a.) What is the work done by the man on the crate?
J
b.) What is the work done by gravity on the crate?
J
c.) What is the net work done on the crate?
J