s1=50 км s2=150 км t1=0.5 ч t2=2 ч vcp=?
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vcp=(s1+s2)/(t1+t2)=(50+150)/(0.5+2)=80 км/ч
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s1=50 км s2=150 км t1=0.5 ч t2=2 ч vcp=?
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vcp=(s1+s2)/(t1+t2)=(50+150)/(0.5+2)=80 км/ч
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2)t=0.5+2=2.5
3l<v>=s/t
<v>=200/2.5=80