The problem is in the picture. frictional forces are neglected. we know the alpha angle and the constant value of velocity v. then find the value of speed "u" when the thread makes angle alpha with horizontal

Two pans of a balance are 24.1 cm apart. the fulcrum of the balance has been shifted 1.33 cm away from the center by a dishonest shopkeeper. by what percentage is the true weight of the goods being marked up by the shopkeeper? assume the balance has negligible mass. answer in units of %.