(1 point) An object with weight W is dragged along a horizontal plane by a force acting along a rope attached to the object. lfthe rope makes an angle t with the plane' then W the magnitude of the force is F : m, where ,u is a constant called the coefficient ot friction. Let W : 50 lb and ,u : .6. \\\\ (a) Find the rate of change ot F with respect to t.\\\\ (b) When is this rate of change equal to zero? Round your answer to the nearest hundredth.\" F'(t] = \\\\ t = rad.\\\\