Static and kinetic friction?

The coefficient of static friction for the tires of a race car is 0.950 and the coefficient of kinetic friction is 0.800. The car is on a level circular track of 50.0 m radius on a planet where g=2.45 m s2 compared to Earth’s g =9.80 ms2. The maximum safe speed on the track on the planet is ____ times as large as the maximum safe speed on Earth.





a.) 0.25





b.) 0.50





c.) 1.00





d.) 2.00





e.) 4.00

Static and kinetic friction?
0.950x m g1 =m v1 ^2 / r


0.800x m g2= m v 2^2 /r


.


divide:


0.950g1/0.800 g2 = v1^2 /v2^2


0.950x2.45 /0.800x9.8 = (v1/v2)^2


1/4 = (v1/v2)^2


1/2 = v1 /v2


v2 =2 v1 .........d.)2