How much work is done if you push a 200 n box across a floor with a force of 50 n for a distance of 20m

The Work done by a Force refers to the release of potential energy from a body that is moved by the application of that force to overcome a resistance along a path.  

It should be noted that it is a scalar magnitude, and its unit in the International System of Units is the Joule (like energy). Therefore, 1 Joule is the work done by a force of 1 Newton when moving an object, in the direction of the force, along 1 meter:  

Now, when the applied force is constant and the direction of the force and the direction of the movement are parallel, the equation to calculate it is:  

(1)

When they are not parallel, both directions form an angle, let's call it . In that case the expression to calculate the Work is:  

(2)

For example, in order to push the 200 N box across the floor, you have to apply a force along the distance to overcome the resistance of the weight of the box (its 200 N).  

In this case both (the force and the distance in the path) are parallel, so the work performed is the product of the force exerted to push the box by the distance traveled . as shown in equation (1).

Hence:

>>>>This is the work  

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this is poiselle's equation from fluid mechanic in physics. mech eng