A box is moved 20 m across a smooth floor by a force making a downward angle with the floor, so that there is effectively a 10 N force acting parallel to the floor in the direction of motion and a 5 N force acting perpendicular to the floor. The work done is
A. 300 J.
B. 100 J.
C. 200 J.
D. 5.0 J.
E. 20 J.
Answer: C
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