# Very tough mechanics problem?

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• Dec 25th 2008, 04:39 AM
fardeen_gen
Very tough mechanics problem?
What is the maximum velocity of slider B if the system is released from rest from x = y. Motion is in the vertical plane. Assume friction is negligible. The sliders(A and B) have equal masses.

Answer: 0.31 m/s

I am unable to do this(i tried the concepts of mechanics which i know of like energy conservation etc. but to no avail). Can anyone help?
• Dec 25th 2008, 05:19 AM
arbolis
I'd start by drawing a free body diagram on body B.
By intuition the angle that the spring forms with the vertical (45° I'd say) will not change with time. You know that the acceleration occurs only vertically.
Maybe that can help you.
• Dec 25th 2008, 05:23 AM
fardeen_gen
The two sliders are attached by a rod(not a spring) of constant length 0.9 m.
• Dec 25th 2008, 11:02 AM
HallsofIvy
Quote:

Originally Posted by fardeen_gen
The two sliders are attached by a rod(not a spring) of constant length 0.9 m.

Then why would they move at all? Are you assuming that B is in a vertical channel and falls under gravity? You didn't say that before. If that is the case then I think I would look at "conservation of energy". A moves horizontally so its potential energy would not change. B will lose potential energy so the total kinetic energy of A and B must equal the lost potential energy of B.