If an object is in equilibrium, which of the following statements is not true?

Both answers (D) and (E) are not true: (D) is not true because the value of the velocity’s constant magnitude need not be zero, and (E) is not true because there may be no force acting on the object. An object in equilibrium has zero acceleration $(\vec{a} = 0)$, so both the magnitude and direction of the object’s velocity must be constant. Also, Newton’s second law states that the net force acting on an object in equilibrium is zero.