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Railways PYQCBT 1 2016

RRB NTPC · Question 28

When a stone thrown directly upwards reaches the top, its: A. Velocity and acceleration are zero. B. The velocity is zero and the acceleration is about 10 m/s^2. C. Velocity is about 10 m/s and acceleration is zero. D. The velocity is about 10 m/s and the acceleration remains the same.

  1. C

  2. D

  3. B

  4. A

Show answer & explanation

Answer: (C) B

Explanation

At the highest point the stone's velocity is zero for an instant, but gravity still acts, so its acceleration is g ≈ 10 m/s² downwards.