One of the conditions necessary for an object to be in equilibrium when acted upon by a number of parallel forces is that the vector sum of the forces is? by Sunday | Nov 6 | Physics JAMB | 0 comments A. Average B. Zero C. Negative D. Positive Correct Answer: Option B – Zero Users Also Read These:If an object is placed between two parallel plane…The component of vector X along the direction of…The diagram below illustrates three forces acting on…When three coplanar and non-parallel forces are in…A ball falling through a viscous liquid is acted upon by?