A car is driving along a circular track of diameter d=.85km at a constant speed of v=28.5m/s. write an expression for the magnitude of the acceleration a of the car in terms of the given parameters

acceleration (a) = velocity (v) * 2 * radius (r) a=v2r r = d/2 [radius is one half of the diameter] a = v (2) (d/2) a = v * d d =.85km * 1000m/km = 850m convert to the same units, meters] a = 28.5 m/s * 850m a = 24,225