No changing Linear Drag (.linearDrag) on rigidbody / rigidbody2D in code?

Hello I have detailed my issue here: http://tinyurl.com/p4kl2oz

It includes a video and my code.

Generally I note that you cannot change Linear Drag via code, unless someone can prove that wrong. If i'm right, why not? No .linearDrag ?. Also why does manually changing Linear Drag override your animations?

As you can see in the link above I am trying to create a boost platform for a 2D character using a rigidbody2D. Thanks for any help in advance.

code below: (requested)

 int bounceAmount = 1;
     
 
 
 IEnumerator Bounce () {
 
 anim.SetBool ("Ground", false); // starts jump animation
 
 //rigidbody2D.angularDrag = 10; //not helping, but is valid
 
 //rigidbody2D.linearDrag = 10; //INVALID CODE, but manually works(helps)
 (note: when Linear Drag is manually set to 10,the player drops back down but overrides the animation)
 rigidbody2D.AddForce(new Vector2(0,    bounceAmount  ));
 yield return new WaitForSeconds(1);
 rigidbody2D.AddForce(new Vector2(0,    -bounceAmount ));
                     
 
 bounce = false;
             
 }