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Although the units of the kinetic energy aren't given, we have to assume that the "3,000"
are joules ... the SI unit of energy; otherwise we can't go anywhere at all with this question.

K.E. = 1/2 m V2 = 3,000 joules

m V2 = 6,000

80 V2 = 6,000

V2 = 6,000/80 = 75

V = sqrt(75) = 8.66 meters per second (rounded)

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