A2 kg mass is held 4 m above the ground. what is the approximate potential energy due to gravity of the mass with respect to the ground?

Gravitational Potential Energy = Mass x Height x Gravitational Acceleration 

Here, Mass = 2 kg, Height = 4 m and Gravitational Acceleration = 9.8 m/sec^2 (this is a fixed/constant universal value)

So, Energy = 2 x 4 x 9.8 = 78.4 Joules

So, the final answer is --> Potential Energy = 78.4 Joules