Understanding Work
Work in physics is defined as the force applied to an object multiplied by the distance the object moves in the direction of the force.
Formula
Work (W) = Force (F) * Distance (d)
Applying the Information
* Force (F) = 200 Newtons
* Distance (d) = 20 meters
Calculation
Work (W) = 200 Newtons * 20 meters = 4000 Joules
Answer
The person needs to do 4000 Joules of work to move the crate.