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It is generally a good idea to gain an understanding of the \"size\" of units. consider the following objects and calculate their kinetic energy in si units.

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2.53 mph = 2.531760 yards/hr = 2.531760/3600 yards/second = 1.2369 yards/second 
1 yard = 36 inches = 362.54 cm = 36.2.54/100 m = 0.9144 m 
1.2369 yards/second = 1.23690.9144 m/s = 1.131 m/s 
34.00 milligrams = 34,0010^-3 g = 34.0010^-6 kg = 3.40010^-5 kg 
momentum = massvelocity = 3.40010^-51.131 = 3.845410^-5 kgm/s (= 3.8510^-5 kgm/s to 3 sig figs)

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