C) 28.9 D) 28.81 E) 28.813 25. During a short interval of time the speed v in m/s of an automobile is given by v = at + br, where the time t is in seconds. The units of a and b are respectively: A) m.s ; most ( ar ? + of 3 B) s'/m; s4/m C) m/s'; m/s' D) m/s'; m/s+ E) m/s ; m/s 26 dir sionsL /T Then B has t