[Telepathic Intruder]

I get 3,096 fps (v²=2Gm/r). In any case, yes only a high-tech gun could fire something at that speed, but then it would be small enough to just burn up in earth's atmosphere if given that (very precise) trajectory. The meteor that hit over Russia recently was several meters across. Launching something like that from the moon would be a major undertaking.

[Telepathic Intruder]

Actually your figure is correct. I messed up the calculation.

[marktwain]

I get 3,096 fps (v2=2Gm/r).

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You are correct. I looked it up the first time, and the source said 2.38 kilometers per second.

NASA says 1.022 kilometers per second.

Good job.

Lots of small arms fire projectiles at above 1 K/S, including the AR-15. Of course, those small objects would not make it through the atmosphere intact.

But bigger objects could have heat shields and guidance systems.

We already have 155mm smart artillery shells that travel close to that.