As the driver steps on the gas pedal, a car of mass 1 150 kg accelerates from rest. During the first few seconds of motion, the car's acceleration increases with time according to the expression...

As the driver steps on the gas pedal, a car of mass 1 150 kg accelerates from rest. During the first few seconds of motion, the car's acceleration increases with time according to the expression below, where t is in seconds and a is in m/s2. a = 1.11 t - 0.210 t2 + 0.240 t3 (a) What is the change in kinetic energy of the car during the interval from t = 0 to t = 3.20 s? J (b) What is the minimum average power output of the engine over this time interval? W (c) Why is the value in part (b) described as the minimum value?