OK, so I have a golf-ish game where there is a ball that moves around the screen with separate x and y velocities which vary based on an angle chosen before the ball is hit. This all works perfectly fine, the ball bounces off the walls, etc. But when I try to apply friction to the ball's movement, I encounter some issues.

The process I am using to scale down my velocity vector while maintaining the same angle of motion is as follows:
   1. Find the magnitude of the vector
   2. Normalize the vector
   3. Decrease the value of the magnitude by a friction constant
   4. Multiply x and y velocity components by the new magnitude
My code looks like this:

Depending on P and θ, the code may or may not work, and I can't figure out why; the ball does seemingly random stuff, often not even going in the right direction.
Also, I don't know if this is relevant, but when I debugged the magnitude, it changed whenever the ball bounced off the left or right of the screen, which I don't think should be happening.
Can anybody help me fix this?

I'm attempting to access arbitrary OS vars from the calculator, and subsequently delete them. The code works with programs, groups, appvars, and letters, but whenever I try to access the vars represented by tokens, it does not work properly. Basically, I copy the randomly selected var name over into another string so that I can delete it, but the string doesn't seem to recognize the tokens following the first one. Here is my code (simplified):

Is there a way to get around this lack of string support for tokens? Like, can these variables be accessed via hex code or something? Thank you!