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Mathematics
Problem
A vector
u
⃗
=
3
i
+
4
j
+
z
k
\vec{u}=3\mathbf{i}+4\mathbf{j}+z\mathbf{k}
u
=
3
i
+
4
j
+
z
k
has magnitude
13
13
13
. If
z
z
z
is positive, find
z
z
z
. a) 8 b) 6 c) 12 d) 13
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