A 1500kg car accelerates from 50km/h to 75km/h. How much work was done?

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A 1500kg car accelerates from 50km/h to 75km/h. How much work was done?

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Ngọc Diệp 4 years 2021-08-21T05:00:46+00:00 1 Answers 17 views 0

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  1. Calantha
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    2021-08-21T05:02:45+00:00
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    Answer:

    Work done, W = 181238.4 J

    Explanation:

    We have,

    Mass of a car, m = 1500 kg

    Initial speed, u = 50 km/h = 13.88 m/s

    Final speed, v = 75 km/h = 20.84 m/s

    Let W is the work done. It is equal to the change in kinetic energy of the car. So,

    W=\dfrac{1}{2}m(v^2-u^2)\\\\W=\dfrac{1}{2}\times 1500\times ((20.84)^2-(13.88)^2)\\\\W=181238.4\ J

    So, 181238.4 J of work was done by the car.

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