private void OnCollisionEnter2D(Collision2D collision)
 {
     if (collision.gameObject.tag == "Enemy Car")
     {
         if (timer > 0)
         {
             Destroy(collision.gameObject);
         }
         else
         {
             Destroy(gameObject);
             //gameObject.SetActive(false);
             ui.gameOverFN();
             am.carSound.Stop();
         }
     }
     if (collision.gameObject.tag == "Power")
     {
         Destroy(collision.gameObject);
         timer = powerTime;
     }
 }