Up, Up, and ... Oops!

Classical Mechanics Level 3

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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