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NDA 2020 GAT · General Knowledge · Motion, Forces and Gravitation · easy

A car starts from rest and moves with a uniform acceleration of 5 m/s^2. The distance covered by it in the first 4 seconds is

Single correct option

A car starts from rest and moves with a uniform acceleration of 5 m/s^2. The distance covered by it in the first 4 seconds is
  1. A. 20 m
  2. B. 80 m
  3. C. 100 m
  4. D. 40 m
Show answer and solution

Answer: (D) 40 m

Starting from rest, s = (1/2) a t^2 = 0.5 x 5 x 16 = 40 m. The value 80 m comes from omitting the factor one-half. The speed after 4 s is at = 20 m/s, which should not be confused with the distance of 20 m.
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Original question written in the NDA 2020 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