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Find the relation between acceleration o...

Find the relation between acceleration of blocks `a_(1),a_(2)` and `a_(3)`.

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`x_(1)+x_(2)+x_(3)+x_(4)=l rArr overset(..)(x)_(1)+overset(..)(x)_(2)+overset(..)(x)_(3)+overset(..)(x)_(4)=0rArr a_(1)+a_(2)+a_(2)+a_(3)=0rArr a_(1)+2a_(2)+a_(3)=0`
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ALLEN -KINEMATICS-EXERCISE-2
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