Gravity on earth is 9.8 m/s^2, and gravity on jupiter is 23.1 m/s^2. so, if the mass of a rock is 70 kilograms, it's weight on earth and its weight on jupiter ?

~686newtons on earth and
~1617 newtons on jupiter
the formula is weight = gravitational acceleration * mass of the object

The objects do not reach terminal velocity         there is not enough time from the time the object falls from when it hits the ground to achieve terminal velocity. an object must be placed higher to achieve terminal velocity in order to be in free fall.

The answer is frictional force