StopObject(objectid, Float:X, Float:Y, Float:Z, Float:Speed)

(objectid, Float:X, Float:Y, Float:Z, Float:Speed)

public OnGameModeInit()
{
      new obj;
      obj = CreateObject(...);
      return 1;
}
public OnPlayerCommandText(playerid, cmdtext[])
{
      if(strcmp(cmd, "/stopobject", true) == 0)
      {
          StopObject(obj);
          return 1;
      }
      return 0;
}