Two identical smooth blocks P and Q, each of mass 2kg, are kept in contact on a frictionless horizontal table. A horizontal force F is applied on block Q toward the right. Which one of the following describes the contact force between the blocks?
a) The contact force is F and acts on P toward the right.
b) The contact force is 2F and acts on Q toward the left.
c) The contact force is 2F and acts on Q toward the right.
d) The contact force is 0."