A 5.0 kg block is sliding down a 30 degree incline as shown. If the coefficient of sliding friction between the block and the incline is u = 0.20 and the acceleration of the block is represented by a, which statement best describes the calculation of the acceleration of the 5.0 kg block? ( a) 0.20 x 5 x 9.8 cos30 - 5 x 9.8 sin30 = 5.0 a ( b) 5 x 9.8 sin30 - 0.20 x 5 x 9.8 cos30 = 5.0 a (D c) 5 x 9.8 cos30 - 0.20 x 5 x 9.8 sin30 = 5.0 a d) 0.20 x 5 x 9.8 sin30 - 5 x 9.8 cos30 = 5.0 a