Question

can there be zero displacement in presence of net force acting over body​

Answer 1

Acceleration in an object could be zero even when several forces are acting on it. This happens when all the forces cancel out each other i.e., the net force acting on the object is zero. For a uniformly moving object, the net force acting on the object is zero.

Answer 2

yes the net force must be zero for that.......

You can also assume the motion of the body in which it repeats the same path