Fast start and ending at jump but slow middle.
 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class MovePlayer : MonoBehaviour {
 
     public KeyCode moveRight;
     public KeyCode moveLeft;
     public KeyCode jump;
 
     public float playerSpeed = 0;
     public float jumpHeight = 0;
 
     public bool isAirBorn = false;
 
     void Start () {
         
     }
 
     void Update () {
 
         //X, Y, Z
         GetComponent<Rigidbody>().velocity = new Vector3(playerSpeed, jumpHeight, 0);
 
         if (Input.GetKey(moveRight)) {
             playerSpeed = 7;
         }
         if (Input.GetKey(moveLeft)) {
             playerSpeed = -7; 
         }
         if ((Input.GetKeyUp(moveRight)) || (Input.GetKeyUp(moveLeft))) {
             playerSpeed = 0;
         }
         if((Input.GetKey(jump)) && (isAirBorn == false)) {
             //jumpHeight = 1 waitXSeconds jumpHeight = 2 WaitXSeconds jumpHeight = 3.... And so on until u get to 8 and then player starts falling.;
             //Making a fast start and ending, and a slow middle.
             isAirBorn = true;
             StartCoroutine(stopJump());
         }
     }
 
     void OnCollisionEnter(Collision other) {
         if(other.gameObject.tag == "grounded") {
             isAirBorn = false;
         }
     }
 
     IEnumerator stopJump() {
         yield return new WaitForSeconds(.35f);
         jumpHeight = 0;
     }
 }
 
 
              
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