# Inertia help!

gamer1319

## Homework Statement

a 40kg duck walks from the outside to the inside of a rotating circular table of mass 100kg. if the rotational intertia of the table is 250kg*m^2 and the duck moves from a radius of 2.5m to 1.5m, find the final angular speed of the table if it rotates at 2.0rad/sec at the moment the duck begins to move.

THANKS! I'm studying for a test and i cant do this question

what i did:

L = 250kg * m^2
Wf = ?