Work is only being done when what happens to an object?

a) the object does not move

b) the object disappears without explanation

c) it moves in the same direction as the force

d) the object moves in the opposite direction of the force

ik it's not a or b

C)it moves in the same direction as the force  

D)The object moves in the opposite direction of the force

Explanation:

As we know by work energy theorem that when work is done on the system of mass then

now as per the definition of work done we know that

so here we will say that when force is applied in the direction of the displacement of the object then it is always positive work and if work is applied in the opposite direction of the displacement of object then it is always negative work.

So here when force is applied then the point of application must move either in the direction of force or in the opposite direction of the force.

so correct answer will be

C)it moves in the same direction as the force  

D)The object moves in the opposite direction of the force

a longitudinal wave moves energy that is to the direction of the wave’s movement. - true