A 4-Kg Block and a 2-Kg Block Can Move on the Horizontal

Multiple Choice

A 4-kg block and a 2-kg block can move on the horizontal frictionless surface. The blocks are accelerated by a +12-N force that pushes the larger block against the smaller one. Determine the force that the 2-kg block exerts on the 4-kg block.

A) -4 N
B) -12 N
C) 0 N
D) +4 N
E) +8 N