1) A uniform 30kg, 10m board is horizontal and hanging over the edge of a building by 4m. The other end is supported by a chair. A 50kg person stands on the board 3m from the end with the chair.
a) How far over the edge can an 80kg person go before the board tips?
b) Which way should the 50kg person move so that the 80kg person can go further out? Toward the chair or toward edge?