Find the acceleration vector in terms of ur and u?.r = a(9 - cos ?) and 
= 4
A. a = (16a( cos ? - a + a cos ?)ur + (32a sin ?)u?
B. a = (16a( cos ? + 9a - a cos ?)ur - (32a sin ?)u?
C. a = (81a( cos ? - 4a + a cos ?)ur + (162a sin ?)u?
D. a = (16a( cos ? - 9 + cos ?)ur + (32a sin ?)u?
Answer: D
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