k = 0.3;
f = 0.90;
vx = vy = 0;
 
onMouseDown = function() {
t._x = _xmouse;
t._y = _ymouse;
}
 
onEnterFrame = function() {
ax = k*(t._x - d._x);
ay = k*(t._y - d._y);
vx += ax;
vy += ay;
vx *= f;
vy *= f;
d._x += vx;
d._y += vy;
}