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NDA 2018 GAT · General Knowledge · Motion, Forces and Gravitation · easy

At the highest point of its flight, neglecting air resistance, its

Single correct option

A ball is thrown vertically upward. At the highest point of its flight, neglecting air resistance, its
  1. A. velocity is zero and acceleration is 9.8 m/s² downward
  2. B. velocity is zero and acceleration is zero
  3. C. velocity is 9.8 m/s upward and acceleration is zero
  4. D. velocity is zero and acceleration is 9.8 m/s² upward
Show answer and solution

Answer: (A) velocity is zero and acceleration is 9.8 m/s² downward

At the top the ball momentarily stops, so velocity is zero, but gravity continues to act, giving a constant downward acceleration of about 9.8 m/s². The common trap is to think zero velocity means zero acceleration; if acceleration were zero the ball would hover there instead of turning back.
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Original question written in the NDA 2018 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