Final answer:
Emily did 5000 joules of work by pushing a box with a force of 25 Newtons for a distance of 200 meters. The calculated work is found by multiplying the force by the distance.
Step-by-step explanation:
The question concerns the concept of work done in physics, which is the product of the force applied to an object and the distance over which that force is applied. When Emily pushes a box with a force of 25 Newtons over a distance of 200 meters, we can calculate the work done using the formula:
Work (W) = Force (F) × Distance (d)
Substituting the given values:
W = 25 N × 200 m
W = 5000 J (joules)
Therefore, the correct answer is B. 5000 J.