Answer:
38 m/s
Step-by-step explanation:
Velocity is the rate of change of distance with time.
.. dd/dt = -38 . . . . meters per second
Speed is the magnitude of velocity.
... |-38| = 38 . . . . meters per second
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Comment on Rachel's distance
Since the distance is decreasing with time, we have to assume that it is measured inside the building, and that negative distance means distance outside the building.
