I'm learning about easing in processing, but I'm getting terrible headaches to make this work, with something that might be simple to do.. so, with this exercise, how can I make the ball slow down the velocity while it goes to the stage width lenght??

2. float x = 0;
3. float speed = 5;
4. 
   
5. void setup(){
6.   size(200,200);
7.   smooth();
8.   frameRate(30);
9. }
10. 
    
11. void draw() {
12.   background(255);
13.   x = x + speed;
14.   
15.   if (x>width){
16.     x = width;
17.   }
18.   //display circle at X location
19.   stroke(0);
20.   fill(175);
21.   ellipse(x,100,32,32);
22. }

Hey guys, how can I make this exercise with triangles or quads ??

I've been trying for a while but I just can't figure it out :/

thanks in advance :)