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2021 · Q22

A bus starting form a bus-stand and moving with uniform acceleration attains a speed of 20 km/h in 10 minutes. What is its acceleration?

General KnowledgePhysics
  1. A200 km/h2
  2. B120 km/h2
  3. C100 km/h2
  4. D240 km/h2

Explanation

Uniform acceleration a = (v - u)/t = (20 - 0) km/h divided by 10 minutes. Converting 10 minutes to 1/6 hour gives a = 20 / (1/6) = 120 km/h^2. The other options arise from failing to convert minutes to hours.