public static SpriteObject AccelerateObject(SpriteObject obj, float acceleration, float dt)
{
var x = obj.GetPosition().X;
var y = obj.GetPosition().Y;
var dx = obj.GetVelocity().X;
var dy = obj.GetVelocity().Y;
var x2 = x + (dt * dx) + (acceleration * dt * dt * 0.5f);
var y2 = y + (dt * y) + (acceleration * dt * dt * 0.5f);
var dx2 = dx + (acceleration * dt) * (dx > 0 ? 1 : -1);
var dy2 = dy + (acceleration * dt) * (dy > 0 ? 1 : -1);
var newObj = new SpriteObject();
newObj.SetPosition(new Vector2(x2 - x, y2 - y));
newObj.SetVelocity(dx2, dy2);
newObj.SetStartPosition(new Vector2(x2, y2));
return(newObj); // need to return a position and velocity (not really a whole new sprite object)
}