As the driver steps on the gas pedal, a car of mass 1 160 kg accelerates from rest. during the first few seconds of motion, the car’s acceleration increases with time according to the expression a 5 1.16t 2 0.210t 2 1 0.240t 3 where t is in seconds and a is in m/s2. (a) what is the change in kinetic energy of the car during the interval from t 5 0 to t 5 2.50 s? (b) what is the minimum average power output of the engine over this time interval? (c) why