A force of 35.0 N is required to start a 6.0-kg box moving across a horizontal concrete floor. (a) W

A force of 35.0 N is required to start a 6.0-kg box moving across a horizontal concrete floor. (a) What is the coefficient of static friction between the box and the floor? (b) If the 35.0-N force continues, the box accelerates at 0.60 ni/s2. What is the coefficient of kinetic friction? .