Physics problem,about the Newton law.?

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A person weighing 490 N stands on a scale in an elevator.

The elevator slows down at -2.2m/s^2 as it reaches the desired floor. What does the scale read?

My problem is that which way does the elevator go?

Up or down?

I don't understand so much.....

I know the answer is up,

but why!?
 
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