63) The problem asks us to solve for the total work done by the forces. Work is known as the transfer of energy from one place to another, and it can be calculated with the following formula.
The cos(theta) is there to let us know that only the forces, or components of forces, acting in the direction of the displacement matter. Components of forces that are perpendicular to the direction of motion do not matter when we are considering work. Our displacement is L and our force will be the vector sum of the forces acting in the same axis as the displacement. So we can come up with the following formula.
After we solve the formula we are left with W = (F - f) * L
Answer: B
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