public class speedParticle : MonoBehaviour {
    private SpeedManager SpeedManager;
    private ParticleSystem thisParticeSystem;
    // Use this for initialization
    void Awake()
    {
        thisParticeSystem = GetComponent<ParticleSystem>();
        SpeedManager = FindObjectOfType<SpeedManager>();
      
    }
    void Start () {
  
    }
    
    // Update is called once per frame
    void Update () {
      
       thisParticeSystem.startLifetime = SpeedManager.Speed;
    }
}