1 !Q2 = !mg h2 h1( )A

!QB = !ms hB hA( )

!ms = !mg

h2 h1hB hA

!ms = !mgh2 h1hB hA

!mg = c1 !Qfh2 = c2 !mg

c1c2 !Qf!

+ c3

h1 = c4hB hA = c5

!ms = c1 !Qfc1c2 !Qf c4

c5

a c12c2c5

b c1c4c5

!ms = a !Qf2 + b !Qf