Which statement is true of an object in equilibrium?

A.

The sum of all the horizontal forces is nonzero.

B.

The sum of all the vertical forces is nonzero.

C.

The sum of all forces acting on the object is zero.

D.

At least one of the forces acting on the object is zero.

C. The sum of all forces acting on the object is zero.

Explanation: Any body can be in state of equilibrium when sum of all the forces acting on the body are zero. State of equilibrium is also called as the state of balance. Equilibrium can be static equilibrium (when body is at rest), transitional equilibrium (when no linear motion) and rotational equilibrium (when no circular motion).

C

Explanation:

An equilibrium is when all forces are the same or canceled out. So it would have to be c.