The position vector of a particle is r(t). Find the requested vector.The velocity at t = 1 for r(t) = (4t2 + 3t + 7)i - 6t3j + (7 - t2)k
A. v(1) = 7i - 6j - 1k
B. v(1) = 11i + 18j + 2k
C. v(1) = 5i - 18j - 2k
D. v(1) = 11i - 18j - 2k
Answer: D
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