$\"\"$

In elementary physics, the work $\"\"$ done by a constant force $\"\"$ in moving an object from a point $\"\"$

to a point $\"\"$ is defined as $\"\"$ .

Generally when the two products are orthogonal then the dot product is zero.

Therefore work done $\"\"$ .

$\"\"$

When $\"\"$ is orthogonal to $\"\"$ then the workdone is $\"\"$ .