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Assuming you need a metric ton, that's 1000 kilograms. To lift that, you need a FORCE of 9800 newtons. Force is related to pressure by: pressure = force / area, so the answer to the original question would depend, over what area the force is applied.
A sloped surface is used to help lift a load up.
You can lift a locomotive or a house with 1 psi, if the pressure is applied over a large enough area.
If you mean vertical speed, you would need to know the amount of lift it's generating, its cross-sectional area and its drag factor (at least!). More info needed.
The answer would depend on the units used for the force. Since these are not specified, it is not possible to answer the question.