Rolling ball script help

Hi, I’m working on a game and i new to android development. my game has a ball that you can control. the way you control the ball is what i need help with. I need it to were you flick you finger in the direction you wont the ball to roll, i do not know how to do this can someone help me do this.

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what I would do is make a empty gameobject where you first place your finger on the screen, and 1 where you let go of the screen. then when its let go, the first gameobject will look at the second, and the rotation of the ball will = to rotation of that object, and speed will depend on distance, hope i helped

Edit: actually that wouldnt really help, if your doing velocity, if you are dealing with velocity, if you are, then have the ball add force in the direction of object 1 (the rotated one) :).