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Question 5225
NEET Physics · Medium

Motion in a Straight Line: Equations of Motion Applications MCQ

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Equations of Motion ApplicationsMediumQuestion 5225

Question

A train running at 72 km/h is stopped by brakes in 8 seconds. The retardation is:
  1. A
    9 m/s²
  2. B
    8 m/s²
  3. C
    2.5 m/s²
    Correct
  4. D
    5 m/s²

Correct answer

2.5 m/s²

Explanation

u = 72 km/h = 20 m/s, v = 0, t = 8 s. a = (0−20)/8 = −2.5 m/s². Retardation = 2.5 m/s².

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