b$)$ calculate the engine power requirement for two cases a and b $(3$ marks$)$:

Calculate the engine power requirement for the case Toyota Prius $($frontal area $=0\mathrm{.}8m^2$ sliding over a street has coefficient of rolling resistance $C_R=0\mathrm{.}015,$ drag coefficient $C_D=0\mathrm{.}26$ air density $=1\mathrm{.}2k\frac{g}{m^3}$ the mass of the car $1500kg.=60$ de gree moving at a speed $50k\frac{m}{h}r.$