An object moves horizontally with displacement r(t) = - * + 13t - 35t + 27, where I(t) is in feet and t is in seconds. a) Write the equations for the velocity and acceleration of the object. v(t) = b) Find the velocity and acceleration at the times below with the units. Determine whether the object is speeding up or slowing down at the times. "(1) = feet a(1 ) = ft/sec? Object is Select an answer w | because velocity and acceleration have | Select an answer v ]at t = 1. v(8) = feet | ft/sec? Object is Select an answer w | because velocity and acceleration have | Select an answer v ] at t = 8. c) Determine the subintervals in [0, 9] for which the object is moving left and right. Use U, for union, to combine multiple subintervals. (Leave answer in exact form, ie, no decimal answers.) Object is moving left on Object is moving right on