Jawabanmu

2014-04-21T19:00:57+07:00
Lt=  lo+lo(α×Δt)
  = 40+40×(0,00002×50)
  =40.040
Mohon diteliti lagi kalau salah.
2014-04-21T19:02:56+07:00
Lt = 40 ( 1 +  α ΔT)
     = 40 + 0,0024
  Lt   = 40,024 cm