Size and mass of the pillar[]
The width of the pillar is fairly inconsistent in the anime, so I'll be using the manga.
According to Daizenshuu 7, Tao is 178 cm tall.
First Image[]
Tao: 199 px = 1.78 m
Tao's arm: 81 px = 0.7245 m
Pillar height: 270 px = 2.415 m
Pillar width: 47 px = 0.42 m
Volume and Mass[]
The volume of a cylinder is pi * radius2 * height.
The radius of the pillar would be 0.21 m.
pi * 0.212 * 2.415 = 0.3346 m3
From the shape and coloring of the pillar, it seems to be made of marble. The density of marble is 2711 kg/m3, giving the pillar a mass of 907.1 kg
Velocity of the pillar[]
To get the distance the pillar traveled, I overlaid many frames of the video over each other and mapped its direction with the path tool in GIMP, then measuring it with a handy plugin by someone called Ofnuts. The path summary can be found here.
The distance from the Sacred Land of Karin to the Red Ribbon Army HQ is 2300 km.
RR to Karin = 415.9 px = 2300 km
Tao's path to going off-screen = 419.8 = 2326.6 km
If we watch the full video frame by frame, it takes Tao from frame 809 to 1008 to go off-screen. This gives us a timeframe of 199 frames, or 7.96 seconds.
(2326.6*1000)/7.96 = 292286.432161 m/s or Mach 852 (Massively Hypersonic)
Force and Attack Potency[]
Acceleration[]
Using the length of Tao's arm.
acceleration = velocity2 / (2 * distance)
292286.4321612 / (2 * 0.7245) = 58958839493 m/s2
Force[]
Using the mass of the pillar.
F = m * a
907.1 * 58958839493 = 5.3481563e+13 Newtons or 5.4536 Gigatons of Force (Class T)
Attack potency[]
Using Work with the length of Tao's arm.
W = F * d
5.3481563e+13 * 0.7245 = 3.8747392e+13 Joules or 9.26 Kilotons of TNT (Town level)