The vertical velocity of the ball is thrown upward _ with time.
Correct answer: A. Linearly
- A. Linearly
- B. Remains constant.
- C. Doubles.
- D. Decreases parabolically.
Explanation
The correct answer is Linearly because when a ball is thrown upward, it experiences a constant acceleration due to gravity which acts downward. As a result, the vertical velocity decreases at a constant rate. This linear decrease means that for every second the ball travels upward, its vertical velocity reduces by a fixed amount until it reaches its maximum height and then becomes negative as it falls back down.Option Remains constant is incorrect because the vertical velocity changes as the ball moves against gravity. Option Doubles is also incorrect because the vertical velocity does not double; it decreases instead. Finally, Decreases parabolically is misleading as it describes the path of the ball rather than the linear change in velocity.
This question appeared on the UHS MDCAT 2008 paper, which you can sit online with every answer explained.
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About Acceleration
Acceleration measures the rate at which velocity changes with time, including changes in speed, direction or both. Work includes average and instantaneous acceleration, the relation a = Δv/Δt, uniform acceleration equations, and interpreting velocity time and displacement time graphs, with acceleration carefully distinguished from velocity.
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