Bow and Arrow functionality in Unity3d

Hello ,

I am making a bow and arrow kind of game , similar to http://www.youtube.com/watch?v=cpLlvka6mag&feature=player_detailpage

I have made this https://dl.dropboxusercontent.com/u/70903877/ArrowGame/ArrowGame/ArrowGame.html Here press and leave mouse to shoot arrows. press space to recreate the arrows.

I want mainly to focus on the projectile motion of the arrow and also the option to set the angle direction for the arrow,when I hold and drag the mouse up and down.

I have tried writing this : if(Input.mouseUp(0)) { rigidbody.AddRelativeForce(Vector3(1.0f,0.5f,0.0f)*5000f); // and also rigidbody.AddForce(Vector3(1.0f,0.5f,0.0f)*5000f); }

But none of them worked. Please give me some kind of ideas. Thanks in advance.