The figure shows an initially stationary block of mass m on a floor. A force of magnitude 0.500mg is then applied at upward angle 0 = 20 What is the magnitude of the acceleration of the block across the floor if (a) Us = 0.630 and MK = 0.510 and (b) Us = 0.440 and Jk = 0.320? (a) Number Units (b) Number i Units