Solving MA: Sum of Forces = Mass x Acceleration

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Oblivion77
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Homework Statement



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Homework Equations



Sum of forces = MA

The Attempt at a Solution



I already found the answer to part A, which is 10kg. But for part B I am not sure which box to draw my FBD on.
 
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Oblivion77 said:
But for part B I am not sure which box to draw my FBD on.
Since you want the acceleration of body A, analyze the forces on body A.