1. Two blocks made of different materials connected together by a thin cord, slide down a plane ramp inclined at an angle θ to the horizontal. The masses of the blocks are mA and mB and the coefficients of friction are μA and μB. PART A If μA < μB, determine a formula for the acceleration of block A in terms of mA, mB, and θ. PART B If μA > μB, determine a formula for the acceleration of block A in terms of mA, mB, and θ. 3. I got Part A right, of which aA, 1= (mAgsinθ+mBgsinθ-AmAgcosθ-μBgcosθ)/(mA+mB) For Part B, I attempted it to solve it, and got the same answer as I did in Part A, yet MasteringPhysics says this is incorrect. Am I doing anything wrong? "The correct answer does not depend on the variables: mA, mB, or μB. " Thanks for the help in advance.