Effects of a human moving faster than sound

Let us suppose that we have people who for all intents and purposes are human, except for one (not so) tiny modification: they are able to exert enough muscular force and react fast enough that they can move their whole body, or their limbs independently, faster than the speed of sound, say $1800{\text{ kmh}}^{-1}$ / $1118{\text{ mih}}^{-1}$/ $500{\text{ ms}}^{-1}$, and can accelerate to such speeds in as little as a few metres or so ($30{\text{ kms}}^{-2}$, or $3061\text{ g}$), without any ill effects to themselves. They can see where they are going and what they are doing; everyone and everything else would appear to be moving in slow motion. They have no special ability to generate thrust, they achieve such speeds by running or jumping or otherwise applying a force against another object.

However, let us also suppose that only their own bodies are protected from the ill effects of such speeds and accelerations. They could throw and catch something at said speeds, and while their bodies would no more be injured by performing such an action than ours would when throwing something, the things that they throw are not so protected. Any clothing they may wear is not protected either.

This ability is gained by magic, but I'm looking for answers that do not rely on magic, only science.

What would the effects on their possessions, the environment and any bystanders be should such a person use this ability?

posted about 10 years ago

Monty Wild‭

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