Question

When three forces acting at a point are in equilibrium?

Answer 1

The object is a point on a string upon which three forces wereacting. If the object is at equilibrium, then the net force acting upon the object should be 0 Newton. Thus, if all theforces are added together as vectors, then the resultant force(the vector sum) should be 0 Newton.

Answer 2

then their momentum is zero ..