Answer:
The correct answer is that you did 1600 J of work on the couch.
Step-by-step explanation:
To solve this problem, we need to remember the equation for work in physics.
Work = Force * Displacement
Now, we must plug in the given information into this equation and simplify.
Work = (400 N)*(4.0 m)
Work = 1600 J
Therefore, your answer is 1600 J. Don't forget that your units for force must be Newtons and the units for displacement must be meters in order to get joules for the units of work.
Hope this helps!