A box is in contact with a surface that makes an angle of 30o with the horizontal. An applied horizontal force of 10.0 N allows the box to slide along the surface at a constant speed. When the box has moved 2.0 m along the surface, the work done on it by the applied force is
A) 0 J.
B) 17.3 J.
C) 20.0 J.
D) 23.1 J.
E) 40.0 J.
Correct Answer:
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