Please solve a exercise which Y!A Vietnam Community had given up:?

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Khát v?ng - Aspiration

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Give a slender slat AB being homogeneous and having equilateral section, length l and mass m. At tip B of slat, people glue a point matter to have mass m/2. The center block of system (slat and point matter) distance tip A a length
A. l/2.
B. l/6.
C. 2l/3.
D. l/3.
 
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