Acceleration script

From **Wikipedia**, acceleration means that an object moves progressively faster.
This means that instead of feeding an object a fixed velocity, you increase the velocity over time. For example:

 //Basic acceleration
 var velocity : float = 10.0;
 var acceleration : float = 10.0;
  
 function Update () 
 {
     //this line adds the acceleration value to the power value over the course of 1 second, up to infinity
     power = power + (Time.deltaTime * acceleration);

     //this line feeds the ever-growing force to the object, propelling it faster and faster over time
     transform.Translate(0, 0, power);
 }

You can do something a little more advanced, such as declaring an initial velocity and a final (terminal) velocity and even a deceleration rate.

This is a little more complex example:

 //Acceleration example, Level 2
 
 //this is our target velocity while decelerating
 var initialVelocity : float = 0.0;
 
 //this is our target velocity while accelerating
 var finalVelocity : float = 500.0;
 
 //this is our current velocity
 var currentVelocity : float = 0.0;
 
 //this is the velocity we add each second while accelerating
 var accelerationRate : float = 10.0;
 
 //this is the velocity we subtract each second while decelerating
 var decelerationRate : float = 50.0;
 
 //movement happens here
 function Update ()
 {
     if(Input.GetKeyDown(UpArrow))
     {
         //add to the current velocity according while accelerating
         currentVelocity = currentVelocity + (accelerationRate * Time.deltaTime);
     }
     else
     {
         //subtract from the current velocity while decelerating
         currentVelocity = currentVelocity - (decelerationRate * Time.deltaTime);
     }
 
     //ensure the velocity never goes out of the initial/final boundaries
     currentVelocity = Mathf.Clamp(currentVelocity, initialVelocity, finalVelocity);
 
     //propel the object forward
     transform.Translate(0, 0, power));
 }

And so on.

Here's the script I use:

  //Acceleration example, Level 2
  
  //this is our target velocity while decelerating
  var initialVelocity : float = 0.0;
  
  //this is our target velocity while accelerating
  var finalVelocity : float = 500.0;
  
  //this is our current velocity
  var currentVelocity : float = 0.0;
  
  //this is the velocity we add each second while accelerating
  var accelerationRate : float = 10.0;
  
  //this is the velocity we subtract each second while decelerating
  var decelerationRate : float = 50.0;
  
  //movement happens here
  function Update ()
  {
      if(Input.GetKey(KeyCode.Space))
      {
          //add to the current velocity according while accelerating
          currentVelocity = currentVelocity + (accelerationRate * Time.deltaTime);
          transform.Translate(0, 0, currentVelocity);
      }
      else
      {
          //subtract from the current velocity while decelerating
          currentVelocity = currentVelocity - (decelerationRate * Time.deltaTime);
          if(currentVelocity > 0) {
              transform.Translate(0, 0, currentVelocity);
          }
          else {
              transform.Translate(0, 0, 0);
          }
      }
  
      //ensure the velocity never goes out of the initial/final boundaries
      currentVelocity = Mathf.Clamp(currentVelocity, initialVelocity, finalVelocity);
  
      //propel the object forward
      
  }