Aforce does work on an object if a component of the force: a) is perpendicular to the displacement of the object b) is parallel to the displacement of the object c) perpendicular to the displacement of the object moves the object along a path that returns the object to its starting position d) parallel to the displacement of the object moves the object along a path that returns the object to its starting position

b) is parallel to the displacement of the object

Explanation:

The work done by a force is defined as

where

F is the magnitude of the force

d is the displacement

is the angle between the direction of the force and the displacement

We see that if the force is perpendicular to the displacement,

And so the work done would be zero: this means that in order to do work, the force should have a component parallel to the displacement.

answer: a. same unit

explanation: