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How do I wiggle numbers?

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I'm doing a video for a physics project about the physics of skiing in which I will show my speed in miles per hour at the bottom of the screen.  The way I'm calculating my speed is by using my acceleration (calculating that came from finding my coefficient of friction, slope, etc.)

Right now I have this expression set up:

 

if(time<A)Math.round((value+(B*(time-C)))*2.23)else(value=D)

In which

 

Variable Definition
ACTI at maximum speed
BAcceleration in M/S
CCTI at initial downhill descent
DMaximum Speed

 

What I want to do is have the maximum speed wiggle a little bit because I'm turning, going off cliffs, etc so it wouldn't be accurate to say that I stay at my maximum speed and I'm too lazy to calculate my decelleration when I turn.

 

Thanks,

Jason

 

One day AE will be smart enough to look at my video and use my PhysX card and just figure everything out


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