Calc Hyper Agent Gridman - Mecha-Stealgun's flight speed

I love it when the series calcs the feats for you.

8:17
MechaStealgun can fly at speeds of mach 15. According to the Hyper Agent Gridman guide (which I got with the SSSS.Gridman guide) Stealgun weighs 68,000 tons.
(Relevant text)

Length 70m
Weight 68,000 tons
Departure Jiro Die Art
Office Colour Pallet Rioto
Flight speed increased to mach 15. It becomes transparent with a hidden command lie or de.

Click to expand...

68,000 tons is 68,000,000kg. What's mach 15 in m/s?

T = 340.29 X 15
= 5104.35m/s

Let's find kinetic energy.

KE = (0.5)mv^2
= (0.5) X 68,000,000 X 5104.35^2
= 8.85849223e14 joules
= 211.7230456500956 kilotons

Final Results
Stealgun's flight speed = Mach 15
Stealgun's kinetic energy = 211.723 kilotons