Given s(t) = 2t- + 2t, 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 = 4 sec a) v(t) = b) a(t) c) When t= 4 sec, the velocity is (Simplify your answer.) When t= 4 sec, the acceleration is (Simplify your answer.)