Let r(t) = 6 lnti – 4tj + 2e2k represents the position of a particle at t > 0. What is the particle's velocity at t= 1? Select one: O 6i+4e²k O 6i – 4j + 4e²k O 4e?i – 4j + 3k O 6i – 4j+ 2e²k

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