The position vector of a particle is r(t). Find the requested vector.The velocity at t = 4 for r(t) = (2 - 5t2)i + (7t + 3)j - e-5tk
A. v(4) = 40i + 7j + 5e-20k
B. v(4) = -40i + 7j + 5e-20k
C. v(4) = -20i +7j + 5e-20k
D. v(4) = -40i + 7j - 5e-20k
Answer: B
Mathematics
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