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A block (A) of mass 45kg is placed on an...

A block (A) of mass `45kg` is placed on another block (B) of mass `123 gk. Now block (B) is displaced by extenal agent by `50 cm` horizontally towards right. During the same time block (A) just reaches to the left end of block (B), Initial and final positions are shown in figures . the work done on block (A) in ground frame is
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A block (A) of mass 45kg is placed on another block (B) of mass 123 kg . Now block (B) is displaced by external agent by 50 cm horizontally towards right. During the same time block (A) just reaches to the left end of block (B), Initial and final positions are shown in figures . the work done on block (A) in ground frame is ,

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