A composite rod is produced by joining, end to end, a glass-reinforced plastic rod and a nylon rod, as shown. The rods each have the same cross-sectional area, and every rod is $1.00\,\text{m}$ long. The Young modulus $E_p$ of the plastic is $40\,\text{GPa}$, and the Young modulus $E_n$ of the nylon is $2.0\,\text{GPa}$. The composite rod breaks once its total extension reaches $3.0\,\text{mm}$. What is the maximum tensile stress that can be applied to the composite rod before it breaks?
- A$7.1 \times 10^{-14}\,\text{Pa}$
- B$7.1 \times 10^{-2}\,\text{Pa}$
- C$5.7 \times 10^{6}\,\text{Pa}$
- D$5.7 \times 10^{9}\,\text{Pa}$