How to figure out what is happening with an approximation?

_igo_r_

camX = map(m, 0, width,-200,200);
camY = map(k, 0, width,-200,200);
camZ = map(n, 0, width,-200,200);   
camera(-camY+300,0,-camY+200,-camZ,camX,0,0,-1,0);
fill (0,0,255);
box(150);
t = 0.7
if (aZ>-0.5 && aZ<0.5){Voz = 0}
else {Voz = Voz + aZ*t1;}   
S1 = 0; 
aZ = accelerationZ;
if (aZ>-0.1 && aZ<0.1){aZ = 0}
S1 = Voz*t1 + (aZ*t1*t1)/2;
if (aZ<-0.5 && aZ<0.5){S1 = 0}
k = k + S1;

This program should allow the user move to the cube and away from it. But when I, for example, move to the cube at first it approximation and then it becomes small like it was in the beginning. I though that it was so because of the acceleration, but I can not find the solution

the final program should imitate the movement. that is why I use formulas

koogs

Duplicate

_igo_r_

How can I get an answer to the question then? and I ve changed it a bit