The answers are saying the same thing in both cases.
Please realise that mark schemes are an aid for people marking and not meant for students as model answers. The objective is to obtain consistency between markers and as an aid to avoid ambiguity.
1) Taking the first question:
The question tells us to ignore air resistance. That immediately tells us that no forces other than gravity will act on the sack.
No air resistance means no change in the horizontal velocity of the sack as it leaves the aircraft. From Newton, the sack will continue in a horizontal straight line because there is no force in the horizontal direction acting to change it's motion in the horizontal direction.
However, there is still the force of gravity acting to accelerate the sack towards the earth. And again from Newton, the sack velocity in the vertical direction will increase because there is the force of gravity acting on it in the vertical direction. i.e. the force of gravity causes the sack to accelerate vertically.
But since both the aircraft and the sack are travelling at the same velocity in the horizontal direction (with no horizontal force acting in the horizontal direction), the sack will hit the ground whilst still directly underneath the aircraft, even though both have travelled a considerable distance horizontally.
2) The answer to the second question should now be apparent.