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NDA 2021 GAT · General Knowledge · Motion, Forces and Gravitation · easy

At its highest point: 1. Its velocity is momentarily zero. 2. Its acceleration is zero.

Single correct option

A ball is thrown vertically upward. Consider the following statements at its highest point:
1. Its velocity is momentarily zero.
2. Its acceleration is zero.
Which of the statements given above is/are correct?
  1. A. 1 only
  2. B. 2 only
  3. C. Both 1 and 2
  4. D. Neither 1 nor 2
Show answer and solution

Answer: (A) 1 only

At the topmost point the velocity changes sign, so it is instantaneously zero. The only force is gravity, so the acceleration remains g (about 9.8 m/s^2) downward throughout the flight. Statement 2 is the common trap: zero velocity does not mean zero acceleration.
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Original question written in the NDA 2021 GAT pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake