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Let the upward velocity of the mass be u. Then why can’t we resolve v into vcosθ from the two pulley and then add up to give u=2vcosθ ? The answer given is v/cosθ .

Let the upward velocity of the mass be u. Then why can’t we resolve v into vcosθ from the two pulley and then add up to give u=2vcosθ  ?  
The answer given is v/cosθ .

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Grade:12

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