Constraint relation in pulley., Physics

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give me a very detailed exlanation of finding d Constraint relaion in strings and how do u find it do set a reference point from which u start taking d Velocities/Accelerations d from.....or u can also take it as difference of velocities of d objects joined 2 d string if d velocities are in opposite directions ....nd sum of vELOCITY IF SAME DIRECTION ND DEN GO WITHD EQUATION dl(1)/dt + dl(2)/dt +....=0

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