\fA man lifts a 1 kg crate directly upwards from the floor to a shelf (8 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.)-d.) You did these parts last week. d.) What was the change in kinetic energy of the crate? (this part overlaps with the last HW, but will get you started here!) e.) What is the change in the potential energy of the crate? f.) Is mechanical energy conserved in this process? (Make sure you understand why.) O no O yes g.) Is the force the man exerts a conservative force? (Make sure you understand why.) O no O yes h.) If it takes 2 s for the man to lift the crate to the shelf, find the man's power output. W