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100km/h=27,78m/s
Sabemos que:
s=((v+u)/2)t
55m=((27,78m/s+0)/2)t
55m=13,89t
t=55m/13,89m/s
t=3,95s
Ahora, sabemos que:
a=(v-u)/t
a=(0-27,78m/s)/3,95s
a=-7,03m/s²
Sabemos que:
F=ma
F=1500kg*-7,03m/s²
F=-10545N (se opone al movimiento del automóvil)