inertial reference frames?

Question

If only a single nonzero force acts on an object, does the object accelerate relative to all inertial reference frames?

Is it possible for such an object to have zero velocity in some inertial reference frame and not in another? If so, give a specific example.

Answer 1

If an object accelerates in one frame, it accelerates in all internal frames.

An object sure can have zero velocity in one frame but not in another.