A cart is pulled a distance D on a flat, horizontal surface by a constant force F that acts at an angle θ with the horizontal direction. The other forces on the object during this time are gravity (Fw), normal forces (FN1) and (FN2), and rolling frictions (Fr1) and (Fr2) as shown below. What is the work done by each force? (Use any variable or symbol stated above as necessary, where the subscript w is lowercase in Fw.)

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