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The cardboard box will collapse when you jumped up in the air.
When they are standing over the cardboard. Cardboard is supporting our weight which results in the whole system is in equilibrium position.
In the equilibrium condition the box will not collapse. But as soon as you want to jump in the upward direction then a force has to be applied. in the upward direction there will be an acceleration according to the Newton second law.
As we know, Newton's third law states that every action has an equal and opposite reaction.
So to push the body upward, we will push the cardboard in the downward direction. With equal force by which we have to make a jump.
Due to this jump the systems equilibrium will not maintained and the box will collapse.
The cardboard box will collapse when you jumped up in the air.
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