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A ring A which can slide on a smooth wir...

A ring A which can slide on a smooth wire is connected to one end of a string as shown in fig. Other end of the string is connected to a hanging mass B. Find the speed of the ring when the string makes an angle `theta` with the wire and mass B is going down with a velocity v.

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Let the speed of the ring is u, then `u cos theta=v`.Because components of velocity along the string should be same.
` implies u=v//cos theta=v sec theta`.
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