My animated 2d character is jumping too high

Hi I have a 2d character jumping multiple times and too high. How can I make it jump only once?

Here’s the script:

public float speedforce = 5.0f;
public Vector2 jumpVector;
public bool isGrounded;
public Transform grounder;
public float radius;
public LayerMask Ground;

// Use this for initialization
void Start () {

}

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

	isGrounded = Physics2D.OverlapCircle (grounder.transform.position, radius, Ground);

	if(Input.GetKey(KeyCode.UpArrow) && isGrounded == false) {
		GetComponent<Rigidbody2D>().AddForce (jumpVector, ForceMode2D.Force);
	}
}

}

Any help would be appreciated

hello , did you try messing up with the gravity? try making the gravity in the rigid body a bit higher
by the way what do you mean by jumping multiple times?

@sadowlight123
I mean if you keep pressing the jump button it will jump very high. How do I add the gravity by the way?