Stop jump animation

How do I stop my jump animation after my player has reached the ground?

public class CharacterController : MonoBehaviour
{
    public float moveSpeed = 5f;
    public bool isGrounded = false;
    public Sprite player;
    float horizontalMove;
    private Animator anim;

 
   
void Start()
    {
        anim = GetComponent<Animator>();
    }

    // Update is called once per frame
    void Update()
    {

        Jump();
     
        Vector3 movement = new Vector3(Input.GetAxis("Horizontal"),0f,0f);
        transform.position += movement * Time.deltaTime * moveSpeed;
        anim.SetFloat("Speed", Mathf.Abs(0f)); //This is where I'm trying to change thee variable to stop the animation, but this part is not working
    }
 
void Jump()
    {
         if (Input.GetButtonDown("Jump") && isGrounded == true)
        {

            gameObject.GetComponent<Rigidbody2D>().AddForce(new Vector2(0f, 5f), ForceMode2D.Impulse);
            
            anim.SetFloat("Speed", Mathf.Abs(5f));  //Here I'm changing the variable so that the animation starts
        }
    }

}

You are resetting the value every frame. The animation doesn’t get a chance to start playing. Instead, add an if statement.

if (isGrounded){
    anim.setFloat("Speed", 0f);
}