A runner increases speed on a straight track from 3.0 m/s to 7.0 m/s in 2.0 s. What is the magnitude of the runner's average acceleration during the time period?

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.

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c. establishing proper sleep hygiene