Final answer:
The crew worker does 50,000 J of work by pushing the crate 200 m.
Step-by-step explanation:
To calculate the work done by the crew worker, we need to multiply the force applied by the distance moved. In this case, the crew worker applies a force of 250 N and moves the cart 200 m. Therefore, the work done is:
Work = Force × Distance
Work = 250 N × 200 m = 50,000 J
So, the crew worker does 50,000 J of work.