Posted by **Anna** on Tuesday, December 7, 2010 at 8:43pm.

A particle is moving around the unit circle (the circle of radius 1 centered at the origin). At the point (.6 , .8), the particle has horizontal velocity dx/dt=3. What is its vertical velocity dy/dt at that point?

I don't know what equation to use or anything for this problem. Please help :) It is much appreciated!

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