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12 September, 15:10

When a car is traveling 120 km/h how many times more kinetic energy would it have than if it were

traveling at 40 km/h?

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Answers (1)
  1. 12 September, 16:27
    0
    Answer: 9

    Explanation:

    Kinetic energy is the energy possessed by a moving object. It is measured in joules, and depends on the mass (m) of the object and the speed (v) by which it moves i. e K. E = 1/2 x mass x velocity^2

    So, car is traveling 120 km/h

    KE = 1/2x m x (120 km/h) ^2

    KE = 0.5 x m x 14400

    KE1 = 7200m

    So, car is traveling 40 km/h

    KE = 1/2x m x (40 km/h) ^2

    KE = 0.5 x m x 1600

    KE2 = 800m

    Now, divide the value of kinetic energy obtained during 120 km/h by that obtained during 40 km/h

    i. e 7200m / 800m

    = 9

    Thus, the kinetic energy will be 9 times more at a speed of 120 km/h than at 40 km/h
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