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JEE Main2004PhysicsMotion in One DimensionActual

An automobile travelling with speed of 60 ~km / h , can brake to stop within a distance of 20 ~cm . If the car is going twice as fast, i.e 120 ~km / h , the stopping distance will be

Options

  1. A20 ~m
  2. B40 ~m
  3. C60 ~m
  4. D80 ~m

Correct answer

D. 80 ~m

Step-by-step solution

If the initial speed is doubled, the stopping distance becomes four times, i.e. 80 ~m .

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