1-2) A rule of thumb for the braking distance of a car is: x = [v/10]². With x being the braking distance in m and v being the current velocity in km/h - meaning that at v = 100 km/h it results that x = 100 m. Which average brake delay a₁ underlies this relation? Which brake delay a₂ really is needed at v = 100 km/h, if the reaction time of the driver and the response time of the brakes is 1s and the car has to stop within 100 m distance after detecting a standing obstacle? Which minimum static friction coefficient μ。 between tires and road is required (4-wheel drive, frictional force FRO = m|a2|)? N

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