Answer
(a) less than
(b) equal to
Work Step by Step
(a) Your value for the jumper's initial gravitational potential energy is zero and your friend's reference point is the ground. This shows us that the jumper's initial gravitational potential energy in your calculation is less than that of your friend's calculation.
(b) We know that the jumper falls through the same distance in both calculations. Thus, the change in gravitational potential energy is the same in your and your friend's calculation.
