Find the velocity vector in terms of ur and u?.r = a(8 - cos ?) and 
= 9
A. v = (9a sin ?)ur + 9a(8 - cos ?)u?
B. v = (9a cos ?)ur + 9a(8 - sin ?)u?
C. v = 9a(8 - cos ?)ur + (9a sin ?)u?
D. v = (8a sin ?)ur + 8a(9 - cos ?)u?
Answer: A
Mathematics
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