24) A car drives along a flat level road according to the following position function; x(t) = = 2t4 - 6t2 + 16t where x is in meters and f is in seconds. The net force on the car is equal to zero when / equals (A) 1.2 seconds (B) 2.6 seconds (C) 3.2 seconds (D) 4.0 seconds (E) 5 seconds