On a curvy road, a motorist applies breaks and the speed of the vehicle is reduced uniformly from 60 km/h at point A to 40 km/h at point B; points A and B are 120 m apart. If the vehicle has a resultant acceleration of 2.5 m/s2 at point A, calculate the radius of the curvature of the road at this point. Calculate also the acceleration of the vehicle at point B where the road has a radius of curvature equal to 90 m.
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sorry i didn't understand
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