1. A mass m sits on a platform that is accelerating in the + direction with a constant acceleration ap. The coefficient of static friction between the mass and the platform is , and the coefficient of kinetic friction is /k, where ( > Uk. (a) What is the maximum value, amaz, that a, can have for the mass not to slip? (b) Suppose that ap > amar. What is the acceleration of the mass, direction and magnitude, in an inertial frame? (c) What is the acceleration, direction and magnitude, of the mass in a reference frame attached to the platform (this is not an inertial frame)