A ladder of weight 400 N and length 10.0 m is placed against a smooth vertical ' wall. A person weighing 800 N stands on the ladder 2.0 m from the bottom as measured along the ladder. The foot of the ladder is 8.0 m from the bottom of the wall. Calculate the force exerted by the wall, and the normal force exerted by the floor on the ladder. (480 N, 1200 N)