In some sense, the ground is accelerating towards you. By jumping out of the plane, you've stopped the plane floor from accelrating you away from the ground at

In some sense, the ground is accelerating towards you. By jumping out of the plane, you've stopped the plane floor from accelrating you away from the ground at the same rate the ground is accelerating towards you. This is barely useful for humans since we are very used to 'standing still' actually involving the force of your weight, so we consider that distinct from acceleration. But physics gets much easier if you don't make that distinction.