Question

Two blocks ( m1 = 6.8kg, m2 = 5.2kg) are in contact with each other while sitting on a friction less surface. M2 is not resting on the frictionless surface, rather to the side of m1. The coefficient of static friction between the blocks is 0.60, and the coefficient of kinetic friction is 0.40. A horizontal force is applied to m1.

What is the maximum force that m1 must exert of m2 so that they move together?