A 20.0 kg box rests on a table.
(a) What is the weight of the box and the normal force acting on it?
(b) A 10.0 kg box is placed on top of the 20.0 kg, as shown. Determine the normal force that the table exerts on the 20.0 kg box and the normal force that the 20.0 kg box exerts on the 10.0 kg box. Show free body diagram too.