The position vector of a particle is r(t). Find the requested vector.The velocity at t = 4 for r(t) = (4t2 + 2t + 5)i - 7t3j + (2 - t2)k
A. v(4) = 34i - 336j - 8k
B. v(4) = 34i + 336j + 8k
C. v(4) = 18i - 112j - 4k
D. v(4) = 30i - 336j - 8k
Answer: A
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