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Kinetic energy of a regulation (standard) baseball (5.1 oz / 145 g) [80] thrown at 93 mph / 150 km/h (MLB average pitch speed). [81] 1.5×10 2 - 3.6×10 2 J: Energy delivered by a biphasic external electric shock (defibrillation), usually during adult cardiopulmonary resuscitation for cardiac arrest. 3×10 2 J: Energy of a lethal dose of X-rays ...