Answer
(a) Higher
(b) I
Work Step by Step
- The ground: inertial frame.
- The elevator: non-inertial frame.
Let $a$ be the magnitude of the acceleration of the elevator. If you are at the ground, you will see the elevator accelerating upward, but if you are in the elevator, you will see the ground accelerating downward with the same magnitude $a$. In fact, any object that is not attached to the elevator, being observed by someone moving with the elevator (the players), will see the object with an additional downward acceleration of magnitude $a$. That is, the dart, relative to the elevator, will experience an acceleration of $a+g$, downward.
