How to derive an equation for the mass of a pendulum bob?
If anyone knows of a resource that shows this (I've looked) or could explain how to derive an equation for the mass of a pendulum would be much appreciated.
EDIT: I'm talking about a simple pendulum. Some more context may be given with the following example:
Some mass $M$ is release from rest at a horizontal position. $M$ reaches the bottom of its path (so directly under the pivot) at a velocity of 2.2m/s. I understand that I can derive for instance, the length of the rope attached to the bob as $L = v^2/2g$. So I can find the length of the rope. Now with no further information is it possible to derive an equation that can be used to describe the mass of this bob?