How to make a 2D object move with constant speed

I'm new to unity and wanted to know how to make a sprite move with a constant speed.

 

That depends on the type of you object and other stuff.
Does the object have a rigidbody component attached? > AddForce(), etc.
No rigidbody? > update the objects position via transform

 

I'm trying to do it without a rigidbody2D component. I want the sprite to bounce off colliders without losing speed as well. I think you reverse the velocity or something?

 

Velocity is a rigidbody attribute.

Could you please show your actual code to have something to start with? Thanks!

 

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class Speed : MonoBehaviour {
5.  
6.     public float speed = 2.0f;  
7.    
8.     void Update () {
9.  
10.         transform.position += transform.right * speed * Time.deltaTime;
11.    
12.     }
13. }
14.  

How can I set the original direction of the of the moving object? Is it through Vector2?

 

Hm I am not sure if I do get you right, sorry. Moving into the opposite direction would be:

Code (CSharp):

1. transform.position += -transform.right * speed * Time.deltaTime;

 

Cool! It worked with my enemy script!