A problem by OJAS JAIN

Level pending

An elevator cab of mass m=500kg is descending with speed v=4m/s when its supporting cable begins to slip, allowing it to fall with constant acceleration a=g/5.During the 12 m fall,let the work done on the cab by the upward pull of the elevator cable be x,the net work W done on the cab during the fall be y.What is the value of |x|+y in kilojoules to the nearest integer?

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