Question

In order to do work, the force vector must be

in the same direction as the acceleration vector.


in a different direction than the displacement vector.


in a different direction than the acceleration vector.


in the same direction as the displacement vector and the motion.

Answer 1

Work is a product of force and displacement. The choice with displacement but in a different direction is not right as force not acting along the displacement will not generate work.

So the answer is force in the same direction as the displacement vector and the motion.

Answer 2

work=force x displacement

so In order to do work, the force vector must be in the same direction as the displacement vector and the motion.