When they say the mass cancels, they mean the maths treats a pebble and a ploughshare the same—but my bisal knows better. The escape velocity is for a mere push, not the true cost of lifting a real, heavy thing. Watching a laden bullock strain uphill, even my almonds feeling heavy in the sack, I see the effort doesn't vanish. So the number is clean, but the universe's real bill is in the weight you carry.
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