As shown below, Block A weights 30 lb. Block B weights 40 lb. Friction coefficient between the two blocks: s = 0 . 6 . Friction coefficient between Block B and the supporting surface: s = 0 . 2 . Answer the following 3 questions based on the block system. (Questions 4-6) 4. The force P required to cause Block A to slide on Block B is:The force P required to cause Block A and Block B to slide together on the supporting surface: The force P required to cause Block A and Block B to slide together on the supporting surface