1. The problem statement, all variables and given/known data During a short interval of time the speed v in m/s of an automobile is given by v = at^3 + bt^4 , where the time t is in seconds. The units of a and b are respectively: (a) m⋅s^2 ; m⋅s^4 (b) s^3/m; s^4/m (c) m/s^2 ; m/s^3 (d) m/s^3 ; m/s^4 (e) m/s^4 ; m/s^5 2. Relevant equations None 3. The attempt at a solution I have not a single clue, and I'm assuming that there is a trick to this that I'm not getting. I know that the velocity is measured in m/s, but I don't understand how finding the units of a and b is even possible.