fatt52

Verified answer

s1=300 м    s2=500 м   t2=50 c   vcp=?

t1=s1/v1=300/6=50 c

vcp=(s1+s2)/(t1+t2)=(300+500)/(50+50)=8 м/с

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vredinochkahelp <v>=S/t=800/60=13,(3), 13 целых 1/3
t=t1+t2=s1/v1+s2/v2=50+10=60