I just watched this video and not particularly invested in either characters or verses, but I thought, I might as well will take care of the actual calc instead of just assuming the boulder weighs around 9 tons.
The Calc[]
Step 1/Volume[]
Leon's official height is 178 cm and is 313 pixels on screen. The Boulder is slightly chipped off on both top and bottom but 740 pixels at least. And the radius is 339 pixels, so it should have roughly 678 pixel diameter. 178/313 * 740 = 420.830670927 cm tall, 192.785942492 cm radius, and 192.785942492*2 = 385.571884984 cm diameter.
Step 2/Mass[]
Density of rock according to the Calculations page is 2700 Kg/m^3. Volume of an Ellipsoid is 4/3 * πabc; where a = 420.830670927/2 = 210.415335464, b & c = 192.785942492. 4/3 * 3.14159265359 * 210.415335464 * 192.785942492 * 192.785942492 = 32757950.6316 cc. 32757950.6316 cc * 2700 kg / 1,000,000 cc/m^3 = 88446.4667053 kg or 88.446 tons. That's Class 100, I certainly wasn't expecting that.
Although, considering she had help from the girl, half of that would still be 44223.2333527 kg or 44.223 tons. Class 50 Ain't bad either. Should also be noted that they don't quite lift the boulder, but that they push it off the bridge.
Further updates[]
Edit: Update credits go to Kepekley23.
- Boulder diameter = 809px = 385.571884984cm
- Screen height = 511px
- Angsizing = 2atan(tan(70/2)*(809/511)) = 73.7492824653 degrees
- Distance from the screen = 257 centimeters
- Boulder diameter = 880px = 385.571884984cm
- Screen height = Same as before (511px)
- Angsizing = 2atan(tan(70/2)*(880/511)) = 78.42632606079 degrees
- Distance from the screen = 236.27 centimeters
Which means that the boulder moved (257 - 236.27) = 20.73 centimeters in about 12 frames, which, in a 25fps video, means 0.48 seconds.
- Acceleration = (2*0.2073m)/(0.48^2) = 1.79947916667m/s²
The mass of the boulder is 88446.4667053kg
- Force = 88446.4667053*1.79947916667 = 159157.574202 newtons, or about 16.229 tons of force.
This results in 8 tons for each of them. That'd be Class 10.
Note: I don't follow Resident Evil so whether people want to use this or not is up the staff who are, but I'll leave this here. Nor am I unsure who it scales to.
Even More Updates[]
Credits from Ugarik
Kepekley23's method only works if there is no friction. In order to find minimal force required to even move the boulder you need multiply its weight by the rock on rock sliding friction coefficient (0.45)
88.446*0.45 = 39.80 Tons of force
Since it was done by two people the result should be halved:
Low End: 19.90 Tons of force (Class 25)
But that was the minimal force to even move it. As a high end I'm going to add additional force from mass and acceleration (Kepekley pesult)
High End: 19.90+8.11 = 28.01 Tons of force (Class 50)
Final Tally[]
Class 25 Lifting Strength low end.
Class 50 Lifting Strength high end.