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A man is moving with 36 kmph. The time of reaction is 0.9 seconds. On seeing an obstacle in the path, he applies brakes and decelerates at 5 m/s2, the total distance covered before he stops is:
  • a)
    19 m
  • b)
    17 m
  • c)
    16 m
  • d)
    18 m
Correct answer is 'A'. Can you explain this answer?
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A man is moving with 36 kmph. The time of reaction is 0.9 seconds. On ...
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A man is moving with 36 kmph. The time of reaction is 0.9 seconds. On ...
Given : 
u  = 36 km/h = 36x (5/18) =10 m/s 
Time of reaction, t = 0.9 s 
decelration, a = -5 m/s^2 
v = 0 m/s 
Let sl be the distance covered by man when the object is seen by him 
we have, u = s1/t
therefore s1 = u x t 
= 10 x 0.9 
= 9 m 
when he applies brakes and decelerates at the rate of 5 m/s2, the distance covered by him is s2 
We have, v^2 = u^2 + 2as2 
therefore 0 = u^2 - 2as2 (because v=0 m/s) 
therefore s2 = u^2/2a = 10^2/2 x 5
therefore s2 = 10 m 
So, total distance covered s = s1+ s2 = 9 +10 =19 m 
Hence 19 m distance covered by man before he stops. 
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Community Answer
A man is moving with 36 kmph. The time of reaction is 0.9 seconds. On ...
36kmh=3685/18=10
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A man is moving with 36 kmph. The time of reaction is 0.9 seconds. On seeing an obstacle in the path, he applies brakes and decelerates at 5 m/s2, the total distance covered before he stops is:a)19 mb)17 mc)16 md)18 mCorrect answer is 'A'. Can you explain this answer? for Class 9 2026 is part of Class 9 preparation. The Question and answers have been prepared according to the Class 9 exam syllabus. Information about A man is moving with 36 kmph. The time of reaction is 0.9 seconds. On seeing an obstacle in the path, he applies brakes and decelerates at 5 m/s2, the total distance covered before he stops is:a)19 mb)17 mc)16 md)18 mCorrect answer is 'A'. Can you explain this answer? covers all topics & solutions for Class 9 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A man is moving with 36 kmph. The time of reaction is 0.9 seconds. On seeing an obstacle in the path, he applies brakes and decelerates at 5 m/s2, the total distance covered before he stops is:a)19 mb)17 mc)16 md)18 mCorrect answer is 'A'. Can you explain this answer?.
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