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23 August, 23:20

Suppose an automobile has a kinetic energy

of 2300 J.

When it moves with six times the speed,

what will be its kinetic energy?

Answer in units of J.

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Answers (1)
  1. 23 August, 23:23
    0
    Given that,

    Kinetic energy of an automobile is 2300J

    K. E = 2300J

    The formula for kinetic energy is

    K. E = ½mv²

    So, if the speed of the automobile is increased by 6, what is the kinetic energy

    Now v' = 6v.

    The mass of the automobile is constant.

    Therefore, the kinetic energy is

    K. E' = ½mv'²

    Where v' = 6v

    K. E' = ½m (6v) ²

    K. E' = ½m * 36v²

    K. E' = 36 * ½mv²

    Where, from above ½mv² = 2300J

    Then,

    K. E' = 36 * 2300 = 82,800J

    The kinetic energy of the automobile when it increase it's speed is 82,800J
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