Find the speed of a particle with the given position function. 
Definitions:
Range
The difference between the highest and lowest scores in a dataset.
Variability
The extent to which data points in a set differ from each other and from their average, or the degree of dispersion within the dataset.
Standard Deviation
A measure of the amount of variation or dispersion of a set of values.
Variability
The degree to which observations in a dataset or statistical distribution vary from the mean and among themselves.
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