A car moves with a constant speed of 18 m/s along a highway that has a parabolic part (A-B) and a circular part with a radius of 3 km (C-D). Determine the deceleration when braking the vehicle when it is at the highest point (position x = 10 km), if the coefficient of friction between the tires and the pavement is 0.6. y y =0,02 x2 km 10 km 2 km
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