pretty good !
very well explained but you need to know basic physics and maths
to understand it
xVel = xVel*(-f*cos2%u03B1+e*sin2%u03B1)+yVe l*sin%u03B1*cos%u03B1*(f+e);
yVel = xVel*sin%u03B1*cos%u03B1*(f+e)+yVel*(
this made it bounce of the "block" better i don't know why I just made the f a -f and the e a +e in the first bracket
but afterward it seemed to bounce better (y)