Solve the problem.At time t = 0, a particle is located at the point (5, 8, 9). It travels in a straight line to the point 
has speed 10 at 
and constant acceleration 
Find an equation for the position vector r(t) of the particle at time t.
A. r(t) = 
(5i + 8j + 9k) + 4i + 3j + 12k
B. r(t) = 
(4i + 3j + 12k) + 5i + 8j + 9k
C. r(t) = 
(4i + 3j + 12k) + 5i + 8j + 9k
D. r(t) = 
(4i + 3j + 12k) + 5i + 8j + 9k
Answer: D
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A. -2 = log 1/9 3
B. -2 = log 3 
C. 3 = log 2 
D. 
= log 3 -2
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