Solved UPSC CDS/OTA Question
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Q · Motion in a Straight lineMedium · 45s
A train moving at 40 km/h is brought to rest in 5 s. Find the retardation.
TopicMotion in a Straight line
Question Typemultiple choice
DifficultyMedium
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
The complete worked solution.
Every step explained — no skipped algebra.
40 km/h = 11.11 m/s. a = (0 - 11.11)/5 = -2.22 m/s².
Final Answer: Option A — 2.22 m/s²