Question: how to calculate kinetic energy density?
Answer: The value of Dk is thus seen to be proportional to the product of the material density ρ=m/V and the square of the speed. For a near earth satellite of mass density of 2000 kg/m3 moving in orbit at v=sqrt(gR)=7.9x103 m/s , the kinetic energy density becomes Dk=6.24x1010J/m3.