Dash to Enemy Script (Unity)

using UnityEngine;
using System.Collections;

/* berkinakkaya.wixsite.com/blog */
public class PlayerAttack : MonoBehaviour {

    [SerializeField] float jumpDistance = 25f;
    [SerializeField] float knockBackPower = 10f;
    [SerializeField] LayerMask enemy;

    bool attacking;
    float lastHitTime;

    void Update()
    {
        if(Input.GetMouseButtonDown(0))
            StartCoroutine("Attack");
    }

    IEnumerator Attack()
    {
        PlayerMovement.PlayerRigidbody.AddForce(transform.right * jumpDistance, ForceMode2D.Impulse);
        attacking = true;
        yield return new WaitForSeconds(jumpDistance/10);
        attacking = false;
    }

    void Hit(GameObject enemy)
    {
        bool enoughtTimeElapsed = Time.time > lastHitTime + 0.1f;
        if(attacking && enoughtTimeElapsed)
        {
            Rigidbody2D hitRigidbody = enemy.GetComponent<Rigidbody2D>();
            Enemy enemyComponent = enemy.GetComponent<Enemy>();
            enemyComponent.ReceiveHit();

            Vector3 force = (transform.right * knockBackPower) + (transform.up * knockBackPower / 2);
            hitRigidbody.AddForce(force, ForceMode2D.Impulse);
        }

        lastHitTime = Time.time;
    }

    void OnCollisionStay2D(Collision2D col)
    {
        if(col.transform.CompareTag("Enemy")) Hit(col.gameObject);
    }
}