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## Homework Statement

Please refer diagram attached.

The pulleys are moving down with constant speed u each. Pulleys are light , string ideal. What is the speed with the mass moves up?

## Homework Equations

## The Attempt at a Solution

Now, I got the answer as ucosΘ, obviously. But the answer is u/cosΘ.

the solution too is given. But I feel that the latter is wrong as the velocity goes to to infinity as the mass goes upwards. Please tell me which is correct.