116. (a) The kinetic energy Kof the automobile of mass mat t= 30 s is Kmv==FHGIKJFHGIKJ=×12121500721000360030 10225kgkm hmkmshJ.bgbg.(b) The average power required is PKtavgJsW.×ΔΔ3010 1054..(c) Since the acceleration ais constant, the power is P= Fv= mav= ma(at) = ma2tusing Eq. 2-11. By contrast, from part (b), the average power is
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