Two Blocks (A AndB) Are in Contact on a Horizontal

Multiple Choice

Two blocks (A andB) are in contact on a horizontal frictionless surface. A 36-N constant force is applied to A as shown. The magnitude of the force of A on B is:

A) 1.5 N
B) 6.0 N
C) 29 N
D) 30 N
E) 36 N