#include <iostream.h>
#include <graphics.h>
#include <math.h>

int main()
{

float x, a, v, k, t;
int i;

int gdriver = DETECT, gmode;
initgraph ( &gdriver, &gmode, "..\\bgi");
setbkcolor(WHITE);
setcolor(4);

x = 300;
v = 0;
t = 0.1;
k = 0.01;

for (i=0; i<10000; i++)
{
a=k*(500-2*x);
x+=v*t + 0.5*a*t*t;
v+= a*t;

circle((int)x,300,20);
line(100, 0, 100, 500);
line(400, 0, 400, 500);
cleardevice();
}

return 0;
}