A 36N force is needed to start a 7.0 kg box moving across the floor. If the 36.0 N force continues, the box accelerates at 0.70 m/s². What are the coefficients of static and kinetic friction?

• A. μs = 0.52 ; μk = 0.64
• B. μs = 0.64 ; μk = 0.64
• C. μs = 0.52 ; μk = 0.45
• D. μs = 0.45 ; μk = 0.32