Unless you are talking about you would survive anyway other then being burried by rubble and the jumping is about getting away from the rubble, no it doesnt realy make a diffrence. Its the same thing as jumping in a free falling elevator befor it hits the ground. While you are jumping you are still falling down it might not look like you do because the elevator/building is further away but relative to the ground you are still falling the whole time and are still accelerating the whole time.
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