<v>=(s1+s2) / (t1+t2)
s1=v1t1
t1=s1/v1
t1=130 000/20=6 500 (c)
s2=v2t2
t2=s2/v2
t2=75 000/15=5 000
<v>=(130 000+75 000) / (6 500+5 000)=18 (м/с)
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<v>=(s1+s2) / (t1+t2)
s1=v1t1
t1=s1/v1
t1=130 000/20=6 500 (c)
s2=v2t2
t2=s2/v2
t2=75 000/15=5 000
<v>=(130 000+75 000) / (6 500+5 000)=18 (м/с)