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102. (a) We assume his mass is between m 1 = 50 kg and m 2 = 70 kg (corresponding to a weight between 110 lb and 154 lb). His increase in gravitational potential energy is therefore in the range 55 12 21 0 31 0 mgh U mgh U ≤Δ ≤ ¡ ×≤ Δ ≤ × in SI units (J), where h = 443 m. (b) The problem only asks for the amount of internal energy which converts into
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