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Q.4 A chain ABAB of length ll is located in a smooth horizontal tube so that its fraction of length hh hangs freely and touches the surface of the table with its end BB (figure shown above). At a certain moment the end AA of the chain is set free. If the velocity with which this end of the chain slip out of the tube is given as v=xghln(lh)√v=xghln(lh). Find xx