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As another wrinkle, we often teach students that it is "best" to always use "standard" units. Eg if you measure in m, kg, and s, your answers will come out in N, J, & W. So if you want your later calculations to come out in "appropriate" units, measuring in meters is most "appropriate"!
-> > 2. Which of the following units would be most appropriate for
-> > measuring the length of a pen?
-> > A: Miles
-> > B: Meters
-> > C: Micrometers
-> > D: Centimeters
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