15 м/с=54 км/ч
Vcр=S/(t1+t2)=S/(s1/v1 +t2)=70/(30/54 + 1)=45 км/ч
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15 м/с=54 км/ч
Vcр=S/(t1+t2)=S/(s1/v1 +t2)=70/(30/54 + 1)=45 км/ч