A 4.00-kg block starts from rest at the top of a 30.0" incline and slides a distance of 2.30 m down the incline in 1.20 s. (a) Find the magnitude of the acceleration of the block. 3.2 m/s2 (b) Find the coefficient of kinetic friction between block and plane. (c) Find the friction force acting on the block. magnitude N direction ---Select-. (d) Find the speed of the block after it has slid 2.30 m. m/s