Given s(t) = 2t-+ 4t, where s(t) is in feet and t is in seconds, find each of the following a) v(t) b) a(t) c) The velocity and acceleration when t = 2 sec a) v(t) = b) a(t) = c) When t =2 sec, the velocity is (Simplify your answer) When t= 2 sec, the acceleration is (Simplify your answer)