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3
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Regarded in relation to something else; Depends on point of view or frame of reference; with respect to
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4
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The SI unit of measurement for this is the second (s)
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5
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Used in physics to mean 'straight line'
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1
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How fast something is moving; The path distance moved per time
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2
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Motion under the influence of only gravitational forces
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6
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How fast something changes with time
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