Answer:
The work done by a force is zero if the displacement is either zero or perpendicular to the force.
Explanation:
The work done is positive if the force and displacement have the same direction, and negative if they have opposite direction and the absolute value of a number is its distance from 0. The absolute value of a number is the magnitude of that number without considering its sign. Since 0 is zero units away from itself, the absolute value of 0 is just 0. The absolute value of 0 is written as |0| and is equal to 0.
