Riding in an elevator moving with a constant upward acceleration, you begin a game of darts.
(a) Do you have to aim your darts higher than, lower than, or the same as when you play darts on solid ground?
(b) Choose the best explanation from among the following:
I. The elevator accelerates upward, giving its passengers a greater "effective" acceleration due to gravity.
II. You have to aim lower to compensate for the upward acceleration of the elevator.
III. Since the elevator moves with a constant acceleration, Newton's laws apply within the elevator the same as on the ground.