Projectile with controlled velocity and angle (Like in Worms)

Hello there. I'm a beginner in Unity and I'm stuck with this particular issue (I couldn't find the answer to this, so I'm posting this here)
So I'm trying to make a 2D turn based 'snowball fight' game where the 2 players gets turns to throw snowballs at each other.
As the title suggests, I am having a hard time figuring out a script which allows the player to throw a projectile with controlled velocity at a particular angle, just like in Worms Armageddon, where the longer you hold the key, the greater is the velocity of the projectile.
I would really be grateful if you could help me with this.
Thank you for your time.

 

You can calculate angle from player coordinates and mouse click coordinates. Take a look at http://www.vitutor.com/geometry/vec/angle_vectors.html

For calculating force of a throw, you need to get the time difference of mouseDOWN and mouseUP, then apply that amount of force to the object.

 

Atan or atan2 should give you the angle I believe also, kozle idea for force sounds a good one to me but I would also clamp it so it can't get to higher value.