where R is the radius and M the mass of the planet. The gravitational acceleration g on the surface is = force divided by the mass of the object:
Therefore g (grav. acceleration on Earth) = (100/16 = about 6) times that on the Moon.
Let us assume that the masses of the two persons in question are 60 and 70 kg, and the distance is about 1 foot (i.e. about 0.32 meters). This gives
(Remember that 1 newton is approximately 4.45 pounds.)