Disregarding air resistance, the diagram showing the free-body diagram of the force or forces acting on the apple is second one.
What is free falling?
When an object is released from rest in free air considering no friction, the motion is depend only on the acceleration due to gravity, g.
Given is an apple is falling from a tree.
When apple is falling down, the gravity will attract the apple towards the center of the Earth. Air resistance is not considered, otherwise it would be acting upwards.
Normal force will not act as apple in not placed on any kind of surface.
So, the only force acting is force of gravity also called as weight of apple.
Thus, the free-body diagram of the force or forces acting on the apple is second one.
Learn more about free falling.
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