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如图：m_2叠放在m_1上，它们之间的静摩擦系数和滑动摩擦系数分别为μ_0和μ，求当外力F为某一给定值时，m_1和m_2的加速度各是多少？
As shown in the figure, m_2 is superimposed on m_1. The static friction coefficient and the sliding friction coefficient between them are μ_0 and μ, respectively. What is the acceleration of m_1 and m_2 when the external force F is a given value?