alt Hacker Newsso assuming inner sidewalk moving at 100 mph, next outer at 95, and each moving at 5 per less, when big muscular terrorists placed on s-100 carrying a big cardboard box filled with nails and throw it as quickly and hard as possible so that the box of nails open up over s-75 at what velocity are the nails raining down on pedestrians on s-75?
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Pedestrians would likely not be hit, because few would want to walk there with a 75mph headwind in the first place.
Assuming that these terrorists are relatively fast runners, being in good shape, and they decide to exit the walkways on the other side, how far on the other side will they be in relation to the nail rain on s-75 they caused.
Compared to doing that from a moving car?
Everybody carries a gun in Heinlein stories, so those terrorists will be quickly dealt with by armed citizens, thus confirming the superiority of Libertarianism.
Oddly I’m pretty sure a strong guy throwing a rock really hard at someone without the walkways would do way more damage. Nails at those speeds just aren’t that dangerous because their momentum is so low and they aren’t particularly sharp.