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Nomor 2
σ = F / A
   = (4 x 10² N) / (2 x 10⁻³ m²) = 2 x 10⁵ N/m²

Nomor 3
E = σ  / e
   = (F / A) / (ΔL / L)
E = FL / (AΔL)
ΔL = FL / (EA)
      = (10⁶ N)(8 m) / [(10¹² N/m²)(4 x 10⁻⁴ m²)] = 0,02 m