13. A combination of pulleys is shown in Fig. 3, where a weight of mass m₁ is hung on the leftmost pulley, and a weight of mass m₂ is attached to the right end of the string. What is m₂ in terms of m₁ so that the system is in equilibrium?
(A) m₁
(B) m₁/2
(C) m₁/3
(D) m1/8
(E) m₁/16
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統計: 尚無統計資料
統計: 尚無統計資料