Determine the minimum acceleration, a, of the large cart necessary to maintain the relative position of the small block of mass m with respect to the cart, i.e. so that it will not slide down the face of the cart if μs = 0.6 at this moment (b) What is the magnitude of the frictional force in this case if m = 2 kg? (c) What is the magnitude of the frictional force on the block if the cart accelerates at twice the minimum acceleration to keep it from falling?