Final answer:
The work done by the force is 100 J.
Step-by-step explanation:
The work done by a force can be calculated by multiplying the magnitude of the force by the displacement in the direction of the force. In this case, the constant 20-N force is applied over a distance of 5.0 m in the direction of the force. Therefore, the work done by the force is:
Work = Force × Displacement = 20 N × 5.0 m = 100 J
So, the correct answer is d) 100 J.