Answer
The elevator is in freefall.
Work Step by Step
If the falling briefcase does not move relative to the elevator floor, then the elevator is also in freefall. The briefcase is apparently weightless.
University Physics with Modern Physics (14th Edition)
by Young, Hugh D.; Freedman, Roger A.
Published by
Pearson
ISBN 10:
0321973615
ISBN 13:
978-0-32197-361-0
Chapter 5 - Applying Newton's Laws - Problems - Discussion Questions - Page 159: Q5.7
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