a) A 50 cm x 30 cm x 20 cm block with a density of 509.7 kg m-3 is to be moved at a constant velocity of 1.10 m/s on a surface inclined at 20° to the horizontal and with a friction coefficient of 0.27. See Fig. 2.0. i) Determine the force that needs to be applied in the horizontal direction. ii) If a 0.40 mm thick oil film with a dynamic viscosity of 0.012 Pa⋅s is applied between the block and the inclined surface, determine the percent reduction in the required force.