Answer:
You were a freeloader of my questions, so I'll be one too.
Since force is mass*acceleration,
F = 70kg * 9.8 m/s
The first answer should be correct if not then the second one
The force of gravity between two objects is:
F = G*m1*m2/r^2
So, it is dependent of the two masses and the distance between their centers of mass.
Force= mass *acceleration=kg* m/s2=kgm/s2