Question:

The question is, how fast would it be for a 1-kilometre wide rock to literally look like it was teleporting, off of its sheer speed, from afar (and digging hundreds of metres into the ground)? The description of the rock being formed in the air suggests it was probably at least a full width (of its body) above the ground, visually-speaking. From a few kilometres away (Rudeus’ POV) it looked like it blipped from its starting position to the deep ground. I would think the time-frame for this could be in the low-milliseconds.

Rough calculation:

For reference, a spherical rock with a diameter of 1 kilometre would weigh 1.4e12 (1.4 trillion) kilograms. For it to cover ~1500 metres in, say 10 milliseconds (arbitrary) would require a speed of around 150000m/s (Mach 437). The kinetic energy of such a heavy and fast-moving object would come out to 1.59e22 Joules (3.8 Teratons of TNT ~ over 60,000× more powerful than the strongest nuclear weapon on Earth, Tsar Bomba).

The appeal to real-world effects in this scenario:

Effects of kinetic impacts are much more localised than thermobaric/nuclear explosions, hence why a country‘s worth of land area wasn’t just wiped off the map here. Though disbelief still needs to be suspended for this, as it would‘ve still caused more damage than shown/described in the actual moment. The energy result would be quite consistent with how strong Laplace’s explosion spell was to split the Ringus Sea as, though Rudeus’ spell is still quite a bit weaker, it’s not WAAAAY far off and is actually approaching that level. Narratively, this was basically his strongest spell to date before he pulled up the nuke spell right after.

______

I‘m very curious on how the anime will portray this moment. I just brought this up for fun now after rereading the fight in both the LN and WN. What do y’all think?

u/EnchantedDestroyer

[LN15/WN spoilers] How fast was Rudeus’ meteor against Orsted? (Read OP)

Question:

Rough calculation:

The appeal to real-world effects in this scenario: