Yes, you can drop rocks on the Earth from the Moon at 11 km/s. You only have to launch them at 2.4 km/s from the Moon's surface.
is the rate of energy return constant with rock scale? Eg will a 2 ton rock hit with force of ~30 tons TNT, or . . . (?)
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Doesn't it have to be since the energy comes from Earth's gravity?
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A smaller fraction of larger rocks will ablate in the atmosphere, but you're limited by the ratio of escape velocities.
End of conversation
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