Explanation
Angular momentum is an axial vector. It is directed always in a fix direction (perpendicular to the plane of rotation either outward or inward), if the sense of rotation remains same.
Due to constant velocity along horizontal and vertical downward force of gravity stone will hit the ground following parabolic path.
The pilot will see the ball falling in straight line because the reference frame is moving with the same horizontal velocity but the observer at rest will see the ball falling in parabolic path.
Due to air resistance, it’s horizontal velocity will decrease, so it will fall behind the aeroplane.
Because horizontal velocity is same for coin and the observer. So, relative horizontal displacement will be zero.
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