Help me fix this problem -noob here-

Hey there, I am new ti unity and trying to get familiar with it and its API I've created a character and wrote script to make it move and jump, everything works fine but when the character jumps and I press 'A' or 'D' to make it move on x-axis it starts moving in that direction gets back to ground very slowly

here's the video that shows the problem i am having
https://s3.amazonaws.com/img0.recor...193888&Signature=y4LNuKYxskKCnOxvaA4QSqqzP9U=

and here's the script

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Player : MonoBehaviour {
public float speed;
public float jumpSpeed;
private Rigidbody2D rb;
private Animator animator;

void Start () {
rb = GetComponent<Rigidbody2D> ();
animator = GetComponent<Animator> ();
}

void FixedUpdate () {
float movementHorizontal = Input.GetAxis ("Horizontal");

animator.SetBool ("Run", false);
if (movementHorizontal > 0 || movementHorizontal < 0) {
if(movementHorizontal < 0)
transform.rotation = Quaternion.Euler(new Vector2(0, 180));
else
transform.rotation = Quaternion.Euler(new Vector2(0, 0));

rb.velocity = new Vector2 (speed * movementHorizontal, 0.0f);
animator.SetBool ("Run", true);

}

if ( Input.GetKeyDown ("w") ) {
animator.SetBool ("Run", false);
rb.AddForce (new Vector2 (0, jumpSpeed), ForceMode2D.Impulse);
}

}
}

 

Please use code tags when posting code.

You are setting the velocity directly when pressing A/D, manually setting the vertical velocity to 0.
Either use forces, like you are for W, or set the vertical velocity to the existing vertical velocity when pressing A/D.

 

Thanks Daniel i changed this

rb.velocity = new Vector2 (speed * movementHorizontal, 0.0);
to
rb.velocity = new Vector2 (speed * movementHorizontal, rb.velocity.y);

and works perfectly now.