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How can I calculate the acceleration in this system?

Homework Statement
I failed to understand how to compute acceleration here , where we do have an accelerated pulley holding two masses
Help me please
Homework Equations
F
20191011_111626.jpg
ma
 
166
39
First of all, consider one block of them, and using only variables (don't substitute with numbers), try to find its acceleration.
Hint : What forces are acting upon each block?
 

kuruman

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Alternatively, if you are in an elevator accelerating up with acceleration ##a## and you stand on a scale, your weight reading will be ##m(g+a)##. Now imagine the pulley being attached to the ceiling of this elevator and you put ##m_1## and ##m_2## on the scale before attaching them to the rope. What would the scale read? Therefore, ...
 

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