In an inertial reference system, we define up as the direction opposite the gravitational force. In a noninertial reference system, up is defined as the direction opposite the vector sum of the gravitational force and any inertial forces. Which direction is up in each of the following cases?
a. An elevator accelerates downward with an acceleration smaller than that of free fall.
b. An elevator accelerates upward with an acceleration larger than that of free fall.
c. An elevator accelerates downward with an acceleration larger than that of free fall.
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