What is the potential energy of a 2-kg vase sitting on a table with a height of 1
meter?

"20 J" is the "Potential Energy" of "vase" on the table.  

Explanation:

The body possess some energy according to the position of the object that is the when an object is placed at a height it stores some energy it is called "Potential Energy".

Formula used to calculate the "Potential Energy" is

Where, "m" is mass of vase is given that 2 kg, "g" is acceleration due to gravity is and "h" is height of the object where it placed is 1 m.

Substitute the given values in the formula,

Potential energy of the vase =

Potential energy of the vase = 20 J

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