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The problem that were having with our scaling of
the ball is a common problem that happens with a lot of key frame animation.
It's caused by the fact that the default tangent
type is Smooth, which generates "best
fit" curves between the keys.
For our Scaling, we
want the curve to be Linear, meaning it
interpolates directly from one key to the next.
Open Track View.
Expand the Sphere's tracks and select the Scale
track:

Set the level to Edit
Keys: 
Right Click on the first Key
in the Scale Track. This will bring up the Key
Info Box.

Change the Tangent
Type for all the Keys to Linear.
(If you don't know how to do this, see Lecture 6 Page 5.)
Now play your animation. You should
have a bouncing ball!
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