Total gravitational potential energy is not conserved (because the piece of clay that was at top originally ends up at the bottom). So any answer with IV in it is wrong, I'm thinking.
EDIT: woops, I thought it was vertical, not horizontal. OK, GPE should remain constant then.
EDIT2...
Homework Statement
A uniform rod has a mass 2m and a length l, and it can spin freely in a horizontal plane about a pivot point O at the center of the rod. A piece of clay with mass m and velocity v hits
one end of the rod, and causes the rod-clay system to spin.
After the collisions...
Homework Statement
A student sits on a rotating stool holding two 2 kg masses. When his arms are extended horizontally, the masses are 0.78 m from the axis of rotation, and he rotates with an angular velocity of 1.7 rad/sec. The student then pulls the weights horizontally to a shorter...