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The time rate of change of energy

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Linear relationship between air resistance and power consumption?

(a) What is the power delivered to the wheels when the car travels at $30 \mathrm{~m/s}$? (b) How much energy does the car use in covering $10\mathrm{~km}$ at $15\mathrm{~m/s}$? At $30\mathrm{~m/s}$? … But in part (c), why does the power delivered to the wheels double again? Is the problem implying that all of the power delivered to the wheels is used to overcome air resistance? …
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