If i pushes a box that weighed 100 N across a 5 m distance, how much work did i do on the box.

You did 500 Nm work on the box.

Explanation:

Work = Force applied x Distance

For an object to tend to move, the force applied must be equal or greater than the weight and coefficient of friction. Considering that the surface is smooth, therefore, the coefficient of friction is negligible.

Force Applied = 100 N

Distance = 5 m

∴ Work = 100 N * 5 m

= 500 Nm

w = 500 j

Explanation:

w = f*d

w = 100*5

w = 500