Adding Velocity To Movement In A Parabolic Arc

Question

Good Evening All,

I am moving my projectiles in a parabolic arc using the following code:

(Credit to Joe Strout for the formula! https://luminaryapps.com/blog/arcing-projectiles-in-unity/)

public IEnumerator JumpInAnArc()
{

    Vector3 startPos = GameEngine.Instance.BattleManager.TurnHero.transform.position;
    Vector3 targetPos = GameEngine.Instance.BattleManager.TargetEnemy.transform.position;
    float jumpSpeed = 3;
    float arcHeight = 3;
    Vector3 nextPos = Vector3.zero;


    

    while (transform.position != targetPos)
    {
        
        // Compute the next position, with arc added in
        float x0 = startPos.x;
        float x1 = targetPos.x;
        float dist = x1 - x0;

        

        float nextX = Mathf.MoveTowards(transform.position.x, x1, (jumpSpeed) * Time.deltaTime);
        float baseY = Mathf.Lerp(startPos.y, targetPos.y, (nextX - x0) / dist);
        float arc = arcHeight * (nextX - x0) * (nextX - x1) / (-0.25f * dist * dist);
        nextPos = new Vector3(nextX, baseY + arc, transform.position.z);

        transform.position = nextPos;
        
        yield return null;
    }


}

This works great, but the speed is consistent throughout the objects entire movement. Now, I would like to add weight/velocity to the object's vertical movement on the Y axis. I would like the projectile start fast and begin decelerating it's Y velocity as it travels up in the Y axis. I'd like it to slowly taper it's velocity to 0 when it reaches it's peak height. Then, I would like it to start accelerating as it falls down towards it's target.

Is anyone able to assist me with how I can accomplish this? Thanks for taking the time!