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Brachiosaurus projectile vomiting: forces 0 C 0 generated and resulting traces Assuming 50 kg (110 Ibs) of regurgitant, impact velocity from 14 m (45 ft) height, and hard-packed sand as impact site. h= 14 m(45 ft) Impact velocity = V = 2gh = 16.6 m/s; kinetic energy before impact = 6,860 J Average impact force = 68,600 N Source: Dinosaurs Without Bones, a book by Tony Martin.