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f = 0.72 n
where f = magnitude of the friction force and n = mag. of the normal force. So we have
n = (14 N) / 0.72 ≈ 19.4 N
By Newton's second law, the object's weight and the normal force cancel, so that
n - m g = 0
where m = mass of the object and g = 9.8 m/s². Then the weight of the object is
m g = n ≈ 19 N