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Calculating work done by a force

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A box moves 5m horizontally when force F=20N is applied at angle θ=135°.
A dark grey box slides along a light grey horizontal surface. the box has a force vector F pulling up and to the left on it. A displacement vector d extends rightwards form the center of the box. The angle between vectors F and d is labeled theta.
What is the work done on the box by F during the displacement?
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