Need help for jumping

Hey guys so I am making a simple 2D platformer game with 3D asset, but I'm having a problem about jumping. So when I press 'W', it only ascending slowly while holding the 'W' button, what I want is when I press 'W', the player jumps instead of ascending awkwardly.
Anyway here's the code snippet, its kinda simple right now:

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class Player : MonoBehaviour {
6.  
7.     public float h_speed = 10f;
8.     public float v_height = 10f;
9.  
10.     // Use this for initialization
11.     void Start () {
12.        
13.     }
14.    
15.     // Update is called once per frame
16.     void Update ()
17.     {
18.         float horizontal = Input.GetAxis("Horizontal") * h_speed;
19.         float vertical = Input.GetAxis("Vertical") * v_height;
20.         Vector2 movement = new Vector2(horizontal, vertical);
21.         transform.Translate(movement * Time.deltaTime);
22.     }
23. }
24.  

Plz help.

 

Have you followed the Unity tutorial about this?

 

ok thx