Explanation :
It is given that,
The diameter of the car's diameter, d = 0.62 m
Radius, r = 0.31 m
Speed of the car, v = 20 m/s
We know that the relation between the angular velocity and linear velocity is given by :
[tex]v=r\omega[/tex]
Where [tex]\omega[/tex] is angular velocity
[tex]\omega=\dfrac{v}{r}[/tex]
[tex]\omega=\dfrac{20\ m/s}{0.31\ m}[/tex]
[tex]\omega=64.5\ rotations/sec[/tex]
Hence, this is the required solution.