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प्रश्न
In the arrangement shown in figure 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
विकल्प
2u cos θ
u/cos θ
2u/cos θ
u cos θ
उत्तर
Along the string, the velocity of each object is the same.
\[2v\cos\left( \theta \right) = 2u\]
\[v = \frac{u}{\cos\left( \theta \right)}\]
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