By careful streamlining, it is possible to reduce the drag coefficient of an automobile from 0.4 to

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By careful streamlining, it is possible to reduce the drag coefficient of an automobile from 0.4 to 0.25 . How much power would this save at $40 \mathrm{mph}$ and $60 \mathrm{mph}$, assuming the effective projected area of the car is $25 \mathrm{ft}^{2}$ ?

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