That all depends where the ball happens to be. Wherever it is,
it weighs (7 kg) times (the acceleration of gravity in that place).
-- On Mars, it weighs (7 kg) x (3.711 m/s²) = 25.977 newtons = 5.84 pounds
-- On the moon, it weighs (7 kg) x (1.623 m/s²) = 11.361 newtons = 2.55 pounds
-- On Earth, it weighs (7 kg) x (9.807 m/s²) = 68.649 newtons = 15.43 pounds
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etc.
