vx1=v1-v01/t=6-0/4=1,5м/с
vx2=v2-v02/t=10-6/4=1м/с
<v>=s1+s2/t
s1=v0t+vx1t^2/2=0*4+1,5*4^2/2=12м
s2=v02t+vx2t^2/2=6*4+1*4^2/2=32м
<v>=12+32/8=5,5м/с
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vx1=v1-v01/t=6-0/4=1,5м/с
vx2=v2-v02/t=10-6/4=1м/с
<v>=s1+s2/t
s1=v0t+vx1t^2/2=0*4+1,5*4^2/2=12м
s2=v02t+vx2t^2/2=6*4+1*4^2/2=32м
<v>=12+32/8=5,5м/с