A ball is thrown at an angle above the horizontal from the top of a cliff and feels no air resistance. A runner at the base of the cliff moves horizontally so that she is always under the ball.is TRUE
What is horizontal?
In this runner's reference frame, the path of the ball is a straight line rather than a parabola.
A direction or plane travelling by a specific point is considered to be vertical in astronomy, geography, and other relevant fields and settings if it contains the local gravity direction at that location. On the other hand, if a direction or plane is perpendicular to the vertical direction, it is said to be horizontal.
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