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Los datos que tienes son:
h = 100 m
Ep = 5000 J
g = 9,8 m/s²
m = ?
Calculamos la masa.
m = Ep/gh
m = 5000 J / (9,8 m/s²) (100 m)
m = 5000 J / 980 m²/s²
m = 5,10 kg
Respuesta.
La masa es = 5,10 kg