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User:MrWarnerTheGreat/Sonic hates Eggman a little too much
Introduction
Sonic throws a rock at Dr.Eggman creating a massive explosion. This will upscale to all the classic era characters since they're all vastly superior to Dr.Eggman.
The Calculation
Building our Final Equation
Metal Sonic is officially listed as about 76.54cm tall

Comparing the rock to Sonic here gives it a diameter of about 13.8051598168 centimeters.
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Rock-Pre Explosion
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The full Explosion
The rock is 2px in the first shot. In the second shot, the explosion is 387px. This makes the explosion's diameter about 26.7129842455 meters.
Now this particular explosion is clearly an air explosion, so we'll be using the air formula.
Final Equation
Y = ((0.0267129842455/0.28)^3)/1000/2 = 1816581179.248 joules or 0.43417332199999997 Tons of TNT. That's a little above baseline Small Building level.