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I need help finding Kenetic energy!?

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Calculate the kinetic energy of an object with a mass of 2.50x10^3 mg traveling at 4.2x10^4 cm/sec in ergs and joules.

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  1. (1/2)(2.5 g)(4.2e+4 cm/s)^2 = 2,205,000,000 ergs

    (1/2)(0.0025 g)(42 m/s)^2 = 2.205 J

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