A person pushes the box he applies a 4 to 400 N and he pushes the box for distance of 4 m after he stops pushing the box slides forward another meter how much work was done by the person

To find the work done by the person, we need to calculate the total work done both when the person is pushing the box and when the box slides forward on its own.

Work done by the person when pushing the box:
Work = force x distance
Work = 400 N x 4 m = 1600 J

Work done by the box when sliding forward:
Work = force x distance
Work = 0 N x 1 m = 0 J

Total work done by the person = 1600 J + 0 J = 1600 J

Therefore, the total work done by the person is 1600 Joules.