VB=⊿x/⊿t=(3.62cm+4.38cm)/2*0.10S=0.4m/s
VC=⊿x/⊿t=(4.38cm+5.20cm)/2*0.10S=0.479m/s
VD=⊿x/⊿t=(5.20cm+5.99cm)/2*0.10S=0.5595m/s
VE=⊿x/⊿t=(5.99cm+6.80cm)/2*0.10S=0.6395m/s
VF=⊿x/⊿t=(6.80cm+7.62cm)/2*0.10S=0.721m/s
VB=⊿x/⊿t=(3.62cm+4.38cm)/2*0.10S=0.4m/s
VC=⊿x/⊿t=(4.38cm+5.20cm)/2*0.10S=0.479m/s
VD=⊿x/⊿t=(5.20cm+5.99cm)/2*0.10S=0.5595m/s
VE=⊿x/⊿t=(5.99cm+6.80cm)/2*0.10S=0.6395m/s
VF=⊿x/⊿t=(6.80cm+7.62cm)/2*0.10S=0.721m/s