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[" 3.In the arrangement shown in figure ...

[" 3.In the arrangement shown in figure "(3-Q3)," the ends "P],[" and "Q" of an inextensible string move downwards with "],[" uniform speed "u" .Pulleys "A" and "B" are fixed.The mass "],[M" moves upwards with a speed "],[[" (a) "2u cos theta," (b) "u/cos theta," (c) "2u/" cose "," (d) "u" cos theta."]]

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