1D Elastic Motion With Frictional Dampening

onEnterFrame = function() {
disty = targetY - ball_mc._y
vy =vy*damp + disty*k ;
ball_mc._y += vy;

1D Elastic Motion With Frictional Dampening & Gravity

onEnterFrame = function() {
disty = targetY - ball_mc._y
vy =vy*damp + disty*k + g;
ball_mc._y += vy;