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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?
Verified Answer
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 s1 be the distance covered by man when the object is seen by him we have, u = s1/t because s1 = u x t=10x0.9 =9 m when he applies brakes and decelerates at the rate of 5 m/s^2, the distance covered by him is s2 We have, v^2 = u^2 + 2as2 because 0 = u^2 - 2as2 (because v=0 m/s) because s2 = u^2/2a = 10^2/2x5 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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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 data:
Initial speed (u) = 36 kmph = 10 m/s
Time of reaction (t) = 0.9 seconds
Deceleration (a) = -5 m/s^2 (negative sign indicates deceleration)

Calculating distance covered during reaction time:
Distance covered during reaction time = Initial speed * Time of reaction
Distance covered during reaction time = 10 m/s * 0.9 seconds
Distance covered during reaction time = 9 m

Calculating stopping distance:
Using the equation of motion: v^2 = u^2 + 2as
0 = (10)^2 + 2*(-5)*s
0 = 100 - 10s
10s = 100
s = 10 m

Total distance covered before stopping:
Total distance = Distance during reaction time + Stopping distance
Total distance = 9 m + 10 m
Total distance = 19 m
Therefore, the total distance covered before the man stops is 19 meters. Hence, the correct answer is option (a) 19 m.
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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 2025 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 2025 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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