# Up, Up, and ... Oops!

In the arrangement shown in the figure, the ends $$P$$ & $$Q$$ of an inextensible spring move downwards with a uniform speed $$u$$. Pulleys $$A$$ & $$B$$ are fixed. The mass $$m$$ moves upwards with a speed of

##### Demasking the problem:

This problem is quite famous. It appeared in IIT-JEE 1982, NSEP 2003 & is also present in the exercises of a good physics book.

Happy Solving!

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