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A 2.2-kg block starts from rest on a rough inclined plane that makes an angle of 25° with the horizontal.The coefficient of kinetic friction is 0.25.As the block goes 2.0 m down the plane, the mechanical energy of the Earth-block system changes by:
Ex Post Facto
A study or analysis conducted after an event has occurred, used to discover causes even though variables are not manipulated by the researcher.
Pretest Posttest
A research design that measures the effects of an intervention by comparing subject scores before and after the intervention.
Experimental Design
The blueprint for conducting a scientific study to ensure that it is valid and reliable; it includes planning, conducting, and analyzing an experiment.
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