Ball revised

gistfile1.txt

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

public class Ball : MonoBehaviour
{
    public Countdown count;
    public GameObject myPrefab;
    public float thrust;
    public Rigidbody rb;

    void Start ()
    {

        rb = GetComponent<Rigidbody>();
        rb.AddForce(transform.forward * thrust);
    }
    void OnCollisionEnter(Collision c)
    {
        if (c.gameObject.tag == "Paddle")
        {
            Vector3 dir = c.contacts[0].point - transform.position;
            dir = -dir.normalized;
            rb.AddForce(dir * thrust * 2.5f);
        }
        else if (c.gameObject.tag == "Block")
        {
            Vector3 dir = c.contacts[0].point - transform.position;
            dir = -dir.normalized;
            rb.AddForce(dir * thrust * 1.5f);
        }
        else if (c.gameObject.tag == "Floor")
        {
            Instantiate(myPrefab, new Vector3(0, 3f, 2), Quaternion.Euler(0,180,0));
            count.currentTime--;
        }
    }
}