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A homogeneous and flexible chain rests o...

A homogeneous and flexible chain rests on a wedge whose side edges make-angle `alpha` and `beta` with the horizontal [refer Fig. 2E., 10(a)]. The cehtrarparcuf the chain lies on the upper tip of the wedge. With what acceleration should the wedge be pulled to the left along the horizontal plane in order to prevent the, displacement of the chain with respect to the wedge?
[Consider all surfaces to be smooth]

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