Motion Analysis

Hi all.

I'm coming to you because I'm trying to make a realistic motion simulation.
I put gravity and I would like the red block to go up then stop and go down, currently it goes up and as soon as there is no more "engine" it falls, is there a way for it to block and be able to start again? 

Thank you.


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You have to put a constraint that is inactive during the climb and then activates just when the piece drops to the top.

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Oh yes it was very simple, I hadn't thought about it at all.  
Thank you very much!!