(10%) Problem 3: A block of mass m = 79.4 kg slides along a horizontal surface. The coefficient of kinetic friction between the block and the surface is uk = 0.33. The block has an initial speed of vo = 12.6 m/s in the positive x direction, as shown. m A I 33% Part (a) Write an expression for the x-component of the frictional force the block experiences, Fr, in terms of the given variables and variables available in the palette. F =