weight of car = 1000*g Newtons
this will be the vertical component of Normal force.
so N = 1000g/cos@
horiz component of N = Nsin@ = 1000gtan@
taking inwards as positive,
1000gtan@ + Friction = mv^2/r, where Friction = F can be +ve or -ve at the moment
but you know mv^2/r = 10*(54km/h)^2...