7. As the driver steps on the gas pedal, a car of mass 1 160 kg accelerates from rest. During the first few seconds of mo- tion, the car's acceleration increases with time according to the expression a = 5.3) W= 21518, p.8 a = (1.16 m/s³)t(0.210 m/s) t2 + (0.240 m/s5) (a) What work is done by the wheels on the car during the interval from t = 0 to t = 2.50 s? (b) What is the output power of the wheels at the instant t = 2.50 s?= Work =\m ​