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Vo=90=25м/c
a=0,3м/c²
S=1000м
S=Vcр*t=t*(V+Vo)/2
t=2S/(V+Vo)
V=Vo-at
поставляем первое во второе уравнение.
V=Vo-a2S/(V+Vo)
Vo-V=2aS/(V+Vo)
2aS=Vo²-V²
600=625-V²
V=√25
V=5м/c=18км/ч