how much time does it take for a car to accelerate from a standing start to 22.2 m/s if acceleration is constant and the car covers 243 m during the acceleration?
The speed changes uniformly with time. Therefore the average speed is given by: [tex]\bar{v}=\frac{22.2}{2}=11.1\ m/s[/tex] The time t taken to travel 243 m at 11.1 m/s is: [tex]t=\frac{243}{11.1}=21.89\ s[/tex]
