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(1) Is the below equation for calculating the maximum velocity for attaining the alleged maximum distance correct, i.e. at what speed should an electric car travel for it to cover the maximum distance?

E of battery - (F rolling friction + F air drag)*(alleged maximum distance) = 1/2*M*V^2

I got 83.5km/h, for M=1543kg, air density=1.2kg/m^3, battery=21kWh, rolling friction coefficient=0.01, air drag coefficient=8.5sq ft, maximum distance=115miles.

Am I right?

(2) I am also asked for the maximum time it could travel at maximum capacity (e.g. up the hill). Given that the motor's power is 95hp, I divided the battery's energy (namely, 21kWh) by that number, and got approx. 18 minutes. Is that correct? Is it reasonable?

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# Electric car and its battery.

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