Mathf.SmoothStep

SmoothStep.cs

public class TestScript : MonoBehaviour
{
 
    public float speed = 0.3f;
 
    void Start()
    {
    }
 
    void Update()
    {
        // 値をスムーズに
        float target = Mathf.SmoothStep(transform.position.y, 10f, Time.time * speed);
 
        transform.position = new Vector2(transform.position.x, target);
    }
}