Answer: The potential energy would be 600kiloJoule
Explanation: The Potential energy of a body is a function of it's wieght mg and height h. That is
Potential energy,
P.E = mass* acceleration due to gravity* height
Acceleration due to gravity is a constant 10m/s²
Potential energy = 2000*10*30 =600000Joule which is also 600kilojoule