A rope pulls on the lower block in the figure with a tension force of 20 N. The coefficient of kinetic friction between the lower block and the surface is 0.16. The coefficient of kinetic friction between the lower block and the upper block is also 0.16. The pulley has no appreciable mass or friction. What is the acceleration of the 2.0 kg block? 
Definitions:
Predictive Validity
The extent to which a score on a scale or test predicts future performance or behaviors.
Norms
Shared standards of acceptable behavior and beliefs within a group or society.
Reliability
Refers to the consistency of a measure or test over time.
Standard Deviations
A statistical measure that quantifies the amount of variation or dispersion of a set of data values from their mean.
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