Give me a very detailed exlanation of finding the 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 sum of VELOCITY IF SAME DIRECTION ND DEN GO WITH EQUATION dl(1)/dt + dl(2)/dt +....=0