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:An object is acted upon by a system of parallel…A piece of cork floating on water is acted upon by…A ball falling through a viscous liquid is acted upon by?Uranium of atom number 92 and mass number 238 emits…When three coplanar and non-parallel forces are in…