How to make jump impulse when fall on top of object

How is the best way without "bugs" to impulse the Y of the player using PHYSICS behavior?

on my game, the player starts falling and he can fall at the top of a "jumpbox" .

I've used the physics impulse action, but I don't know if this is the best for this case..

And I can't use ON COLLISION OF.. maybe "is overlapping" .. but I don't know..

thanks for help!

Help please :/