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An object is released from rest at some height above the ground. In addition to gravity, air exerts a constant horizontal acceleration on the object throughout its fall. The path of the object as seen from the ground frame will be a

1. Parabola
2. Vertical straight line
3. Horizontal straight line
4. Straight line inclined from vertical

Correct answer: Straight line inclined from vertical

Solution

Since the object starts from rest and has a constant net acceleration (g downward plus constant a horizontal), the displacement at every instant is in the direction of that net acceleration vector. The path is therefore a straight line inclined from the vertical toward the direction of the horizontal acceleration.

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