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MCQ practice · SSC Physics Board questions · Chapter 2: Motion

Dhaka Board 2021

If the velocity does not change (u = v), the equations for the distance covered are-

  1. i. S = ut + 1/2 at²
  2. ii. S = ((u + v)/2) t
  3. iii. S = vt

Think it through first, then pick an option.

  1. a i and ii
  2. b i and iii
  3. c ii and iii
  4. d i, ii and iii
Answer and explanation

Correct answer: d i, ii and iii

When u = v there is no acceleration. All three formulas then reduce to the same S = ut = vt, so all three apply.

Why the other options are wrong

  • a i and ii: Statement iii is also true: when u = v, a = 0, so S = ut = vt. Here iii is left out.
  • b i and iii: Statement ii is also true: when u = v, (u + v)/2 = u = v, so S = vt. Here ii is left out.
  • c ii and iii: Statement i is also true: when u = v, a = 0 and ½at² vanishes, leaving S = ut. Here i is left out.