At the same temperature, the molecular speeds of two gases are $u_1$ and $u_2$, and their masses are $m_1$ and $m_2$, respectively. Which of the following expressions is correct?
- A$m_1u_1^2 = m_2u_2^2$
- B$m_1u_1 = m_2u_2$
- C$m_1u_2 = m_2u_1$
- D$m_1u_2^2 = m_2u_1^2$
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