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25 February, 15:24

How much power should a braked 1.5t car have to be braked to reduce its speed from 30m / s to 10m / s in 5s?

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  1. 25 February, 15:41
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    -120000 W

    Explanation:

    Power = change in energy / time

    P = ΔE / t

    P = (½ mv₂² - ½ mv₁²) / t

    P = m (v₂² - v₁²) / (2t)

    Given m = 1.5 t = 1500 kg, v₂ = 10 m/s, v₁ = 30 m/s, and t = 5 s:

    P = (1500 kg) ((10 m/s) ² - (30 m/s) ²) / (2 * 5 s)

    P = - 120000 W
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