You have to have much more info to do this. On way is to do braking distance.
Vf^2=0=Vi^2+2 Forcebraking/masscar)*distancestopping)
and forcebraking=masscar*coefficent
so this ends up as
2*coefficent*distance=initialvelocity^2
and you solve for the coefficent.
calculate the coefficient of kinetic friction for tyre rubber on the road surface
2 answers
hearing rattles from a snake, a boy make two rapid displacements of magnitude 1.8m and 2.4m in sketches show how the two displacements might add up to give magnitude of