Boxes are transported from one location to another in a warehouse by means of a conveyor belt that moves with a constant speed of 0.50 m/s. At a certain location the conveyor belt moves for 2.0 m up an incline that makes an angle of 10" with the horizontal then for 2.0 m horizontally and finally for 2.0 m down an incline that makes an angle of 10^o with the horizontal. Assume that a 2.0 kg box rides on the belt without slipping. At what rate is the force of the conveyor belt doing work on the box as the box moves

(a) Up the 10^o incline,

(b) Horizontally, and

(c) Down the 10^o incline?