An erect pencil on a frictionless plane

[zheng89120]

Homework Statement

A pencil is released from rest with θ = pi/2 and topples over. Treat the pencil as a uniform rod and find the velocity of the end A when it strikes the table if the table is frictionless.

Homework Equations

Classical Mechanics

The Attempt at a Solution

conservation of energy? not sure
conservation of momentum? doesn't seem to work

 

[ehild]

Homework Equations

Classical Mechanics

What part of Classical Mechanics do you think of?

The Attempt at a Solution

conservation of energy? not sure

Is there any force which does work and is not conservative?

ehild