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NDA 2019 GAT · General Knowledge · Motion, Forces and Gravitation · medium

A body starts from rest and moves with a uniform acceleration of 2 m/s^2. The distance it covers in the 5th second of its motion is

Single correct option

A body starts from rest and moves with a uniform acceleration of 2 m/s^2. The distance it covers in the 5th second of its motion is
  1. A. 9 m
  2. B. 25 m
  3. C. 10 m
  4. D. 16 m
Show answer and solution

Answer: (A) 9 m

Distance in the nth second = u + a(2n - 1)/2 = 0 + 2(9)/2 = 9 m. The value 25 m is the distance covered in the first 5 seconds (1/2 x 2 x 25), and 16 m is the distance in 4 seconds. The nth second is a single interval, not the total time.
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Original question written in the NDA 2019 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