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NDA 2016 GAT · General Knowledge · Motion, Forces and Gravitation · easy

At the highest point of its path, its acceleration is

Single correct option

A ball is thrown vertically upward. At the highest point of its path, its acceleration is
  1. A. 9.8 m/s² directed downward
  2. B. zero
  3. C. 9.8 m/s² directed upward
  4. D. equal to its initial acceleration but directed upward
Show answer and solution

Answer: (A) 9.8 m/s² directed downward

Only gravity acts on the ball throughout its flight, so acceleration is g downward at every instant, including the top. At the top the velocity is momentarily zero, not the acceleration. Students often confuse zero velocity with zero acceleration; if acceleration were zero the ball would stay there instead of falling back.
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Original question written in the NDA 2016 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