Suppose that when a car is driving at 40 km/h, its braking distance (i.e. the distance it takes to decelerate to a full stop) on flat ground is 50 meters. When the car is driving at 100 km/h, approximately how long would the braking distance be?Assume that the road conditions are exactly the same, and that the friction force acting on the car is constant in both cases. Ignore air resistance.

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