Question

What is the potential energy of the tank when its size is 30*30*30

Answer 1

first of all potential energy, P = mgh
so it depends on the height of the object. since the height from the ground is not specified, it can be assumed as the height of the tank, ie, 30
g = 9.81
lets assume the mass to be unity
PE =mgh
PE = 1*9.81*30
PE = 29.4