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MHT CET202015 Oct 2020Evening ShiftPhysicsMotion in One DimensionActual

A vehicle moving with 15 ~km / hr comes to rest by covering 5 ~m distance by applying brakes. If the same vehicle moves at 45 ~km / hr , then by applying brakes, it will come to rest by covering a distance

Options

  1. A15 ~m
  2. B45 ~m
  3. C60 ~m
  4. D30 ~m .

Correct answer

B. 45 ~m

Step-by-step solution

( u =15 ~km / hr = 15 1000 60 60 = 150 36 ~m / s ) ( v ²= u ²-2 as ) ( a u² 2 ~s = 150 150 36 36 2 5 ~m / s ² ) Next ( s = u² 2 a = 45000 60 60 45000 60 60 1 2 36 36 150 15 ) (=45 ~m )

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