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t1=10min=600s
v1=42km/h=11,(6)m/s
t2=2min=120s
v2=0m/s
Szukane:
Vsr=?
a=|(v2-v1)|/t =(v1-v2)/t
s1=v1*t1=11,(6)m/s*600s=7000m
s2=(at^2)/2=((v1-v2)*t)/2=(v1*t2)/2=(11,(6)m/s *120s)/2=700m
Vsr=(s1+s2)/(t1+t2)=(7000m + 700m)/(600s+120s)=10,694 m/s