For the position function s(t)=3t^2-2t+1, where "t" is measured in minutes and "s(t)" is measured in feet, use the Limit Definition of the Derivative to find each of the following (and be sure to include appropriate units in your final answers):

a) Velocity, which is s'(t).

b) Acceleration, which is (d^2s)/(dt^2).

*Note: I'm just using different derivative notations for practice!