Answer :

AL2006
Weight = (mass) x (acceleration of gravity)

Weight = 63 N
On Earth, acceleration of gravity = 9.8 meters per second².

                       63 N = (mass) x (9.8 meters per second²)

Divide each side of the equation by (9.8 m/s²).

                       63 / 9.8 = Mass

                       Mass = 6.4 kilograms