A 7.5 kg box is on a table. What is the normal force acting on the box in each of the following situations?
a) You leave the box alone.
b) You push down on the box with a force if 20 N.
c) You pull up on the box with a force of 20 N.
a) You leave the box alone.
b) You push down on the box with a force if 20 N.
c) You pull up on the box with a force of 20 N.