Question

Need help!!
A car skids to a stop on a road with a uk of 1.1. If the intial speed of car is 50 km/h how many meters long are the skid marks.

Answer 1

here we have to keep in mind that the work done by the friction force has to be equal to the kinetic energy change, so we can write:
\[\Large {\mu _k}mgd = \frac{1}{2}m{v^2}\]
where m is the mass of your car, and d is the requested distance.
Furthermore g is the earth gravity, and v is the velocity of our car