codewars???: Braking well

https://www.codewars.com/kata/565c0fa6e3a7d39dee000125/train/java

//--https://www.codewars.com/kata/565c0fa6e3a7d39dee000125/train/java
package codewars;
public class Braking{
  public static double dist(double v, double mu){  // suppose reaction time is 1
    v = v * 1000 / 3600;
    double d = v * 1;
    d += v*v / (2 * mu * 9.81);
    return d;
  }

  public static double speed(double d, double mu){  // suppose reaction time is 1
    // d = v * 1 + v*v / (2 * mu * g)   // g = 9.81 m/s/s
    return 0.0;
  }
}