समान सतहों के युग्म के लिए निम्नलिखित में से कौन सा संबंध विभिन्न घर्षण बलों के अधिकतम परिमाणों की सही तुलना करता है?

Object A (mass = 2 kg) is placed on a rough horizontal floor, and Object B (mass = 1 kg) is placed on top of Object A. The coefficient of friction between the floor and Object A is 0.1, and between Object A and Object B is 0.2. A horizontal force F is applied to Object A. Taking g = 10 m/s2, which of the following statements is/are true? (I) The two objects will move together if F = 10 N. (II) The maximum value of F for which the two objects move together without slipping is 9 N. (III) Object B will slip with respect to Object A if F = 10 N.

A block of mass 5 kg is placed on a horizontal surface. The coefficient of static friction between the block and the surface is 0.4. Taking g = 10 m/s2, what is the maximum force of static friction that can act on the block?