Error in physics as3 - actionscript-3

Question

Help me find the error in physics as3.
After the addition of gravity errors.
hero enters the platform
How to create the correct physics, physics?
mc - Sprite (Circle)
kv - Sprite (Platform irregular shape)
import flash.events.Event;
var gradus: Number ;
var speed: Number = 1;
var direction: Point;
const gravity: Point = new Point(0, 0.001);
var i: int;
direction = getStartDirection(speed, 90);
stage.addEventListener(Event.ENTER_FRAME, ef);
function addVector(v1: Point, v2: Point): Point
{
return new Point(v1.x + v2.x, v1.y + v2.y);
}
function getStartDirection(length: Number, angle: Number): Point
{
var aRad: Number = (angle * Math.PI) / 180;
var xpos: Number = length * Math.cos(aRad);
var ypos: Number = length * Math.sin(aRad);
return new Point(xpos, ypos);
}
function ef(e: Event): void
{
for (i = 0; i < 10; i++)
{
mc.x += direction.x;
mc.y += direction.y;
var test: Number = hitTestAngle(kv, mc.x, mc.y, 10);
if (test)
{
var a1: Number = (Math.atan2(direction.y, direction.x)) * (180 / Math.PI);
gradus = test - (360 - 90 - test - (90 - a1));
if (speed > 0.01)
{
speed /= 1.05;
}
else
{
speed = 0;
}
direction = getStartDirection(speed, gradus);
}
else
{
direction = addVector(direction, gravity);
}
}
}
function hitTestAngle(shape: Sprite, xPos: Number, yPos: Number, radius: Number): Number
{
var samples: uint = Math.abs(radius * Math.PI);
const PI2: Number = Math.PI * 2,
SAMPLE: Number = 1 / samples;
var dx: Number, dy: Number, a: Number, tx: Number = 0,
ty: Number = 0,
hits: int = 0;
var i: int = samples;
while (i--)
{
a = PI2 * (i * SAMPLE);
dx = radius * Math.cos(a);
dy = radius * Math.sin(a);
if (shape.hitTestPoint(xPos + dx, yPos + dy, true))
{
hits++;
tx += dx;
ty += dy;
}
}
if (!hits)
return NaN;
return Math.atan2(ty, tx) * (180 / Math.PI);
}