Introduction[]
In My Hero Academia, Fat Gum uses his ability "Spear" to launch Rappa and Tengai into a wall, leaving a large crater. I'll be calculating the energy needed to perform this feat.
Calculation[]
Scan 1
First we need to measure the width of Rappa's arm.
Twice's Head = 177/8 = 22.125 cm
Rappa's Arm = 40.30 cm
Now we have to find the width, depth, and radius of the crater.
Scan 2
Rappa's Arm = 40.30 cm
Crater Width = 31.98 m
Axis 1 = 31.98/2 = 15.99 m
Crater Depth (Axis 2) = 2.45 m
Crater Radius (Axis 3) = 27.14 m
We put these values on this Ellipsoid Calculator and then halve the result to get the volume of a semi-ellipsoid.
Volume = 4453.62/2 = 2226.81 m^3 or 2226810000 cm^3
Violent fragmentation of concrete is 20 j/cm^3.
Energy = 2226810000 x 20 = 44536200000 Joules
Final Tally[]
Fat Gum's Spear Creates a Crater = 10.64 Tons of TNT (Large Building level+)
The attack was previously weakened by Tengai's Barrier, and the crater was created by launching Rappa into the wall instead of the direct hit, so it's likely a City Block level attack. Rappa was able to survive and stand up after this, so his durability should scale as well.