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

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

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