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The moon has an orbital velocity of ~1km/s, an M777 howitzer has a muzzle velocity of ~0.8km/s

And it should also be 300 earth lengths away what is your point ? what is the moon’s orbital velocity if it’s one earth length away?

4.6 km/s, if it was orbiting one earth's diameter above the surface. Seven hour rotational period. Gnarly tides.