Answer
Rachel’s speed is 38 m/s. Here’s the breakdown: Velocity represents the change of distance over time, which is calculated as dd/dt = -38 m/s. To find speed, we take the absolute value of the velocity, yielding |-38| = 38 m/s. Now, regarding Rachel’s distance, since it is decreasing over time, we can interpret this as her being inside the building, where a negative distance indicates moving outside the building.
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