Rigidbody rb = GetComponent<Rigidbody>();
 Vector3 v3Velocity = rb.velocity;

[STAThread]
    static void Main() {
        if (Environment.OSVersion.Version.Major >= 6) SetProcessDPIAware();
        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);
        Application.Run(new MyForm());             //редактируем как нужно
    }

    [System.Runtime.InteropServices.DllImport("user32.dll")]
    private static extern bool SetProcessDPIAware();

MyClass instanceOfMyClass = new MyClass();
 instanceOfMyClass = null;