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## Homework Statement

A 75 g 30 cm long rod hangs vertically on a frictionless, horizontal axle passing through its center. A 10g ball of clay traveling horizontally at 2.5 m/s hits and stick to the very bottom tip of the rod. To what maximum angle measured from the vertical, does the rod with attached ball of clay rotate?

## Homework Equations

## The Attempt at a Solution

I have a few questions as I am writing down things to start this:

Can I calculate the moment of inertia for the rod and the moment of inertia for the ball around the pivot point and add those together?

Then I think I'll use conservation of energy where K of the ball initial = the rotational kinetic energy of the clay and rod. Then somehow I have to equate that to potential energy. The trouble I'm having is can I just use mgh with the total mass of the ball of clay and the rod as m, or does the fact that this is an extended object make a difference?