4. For what value(s) of k are the vectors u - (1, k, 4k+3) and v = (k+2, -5, 2) perpendicular? 4 A 5. A box with a mass of 14 kg is resting on a ramp that is inclined at an angle of 20. What equilibrium force is needed in order to keep the box from sliding down the ramp? Round your final answer to 1 decimal place. 4 App 200