A+B→C+D+∆E
%KC=KC∆E.100%=mDmD+mC.100%
%KD=100%-%KC
Δx=x2-x1
Vtb=ΔxΔt=x2-x1t2-t1
v=SΔt=St2-t1
x=xo+v.t
S=x-xo=v.t