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vm=(vi+vf)/2 ----> vm=((15+18)m/s)/2=16.5m/s
Aceleración
a=(vf-vi)/t ---> ((18-15)m/s)/4s=0.75m/s^2
Distancia recorrida
x=vi*t+(a*t^2)/2 ---> 15m/s*4s+(0.75m/s^2*16s^2)/2=66m