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120km/hr= 33.333 m/s
a) Aceleracion = -V/t = -33.33m/s / 15s = -2.22 m/s^2
b) Distancia= Vt+1/2at^2 = 33.33 m/s (15s) + (-1.11m/s^2)(15s)^2
= 499.95 m -249.75 m
=250.2 m