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22 December, 22:50

Which statements about braking a car are true?

The greater the kinetic energy of a car, the longer it takes for the car to stop.

The lower the kinetic energy of a car, the longer it takes for the car to stop.

If the speed of a car doubles, the car's kinetic energy and braking distance quadruple.

If the speed of a car doubles, the car's kinetic energy and braking distance remain the same.

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Answers (2)
  1. 22 December, 22:58
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    Answer: C. If the speed of a car doubles, the car's kinetic energy and braking distance quadruple. And A. The greater the kinetic energy of a car, the longer it takes for the car to stop.
  2. 22 December, 23:14
    0
    The greater the kinetic energy of a car, the longer it takes for the car to stop.

    If the speed of a car doubles, the car's kinetic energy and braking distance quadruple.

    Explanation:

    The kinetic energy is given by the formula,

    ½ mv²

    where m is the mass and v is the velocity.

    So when the velocity or speed doubles the kinetic energy will quadruple.

    A car moving with high kinetic energy has a high speed or velocity therefore it is going to take more time to reduce the higher speed and bring the car to a halt.
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