Answer to Question 7

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The engine can be assumed to give out its maximum power at top speed. 

The time the battery will last for is:

t = 41 kWh 66 kW = 0.621 h (= 37 minutes).

Range = 140 km h-1 0.621 = 87 km

(Your battery may be discharged, but the cops will ensure that you are fully charged:

  • speeding (good for at least 3 points);
  • reckless driving;
  • failing to stop when required by a police officer;
  • etc.)