How much work is done in moving a load 15 meters using a force of 15 Newton's

Answer: 225 joules.

Explanation:

If this a one dimension problem, this is the motion is in the same direction of the force, the equation for work is:

Work = distance * force

⇒ Work = 15 m * 15 N = 225 joules.

This is a special case of the general equation

Work = |F| |displacement| cosine (angle between the force and displacement)

When force and displacement are in the same direction, the angle is 0, so cos (0) = 1. This is the two vectors are parellel and the work is just the product of the two magnitudes (force and distance)