Question

If an object is accelerating, can the net force acting on it ever be zero?

Answer 1

No.

Explanation:

According to Newton's first law of motion :

An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

So acceleration can only occur when the forces acting on an object are unbalanced. Therefore if the net force is zero, acceleration can not occur.