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Mathematics
Mathematics
Problem
Vector
M
\mathbf{M}
M
has components
(
5
,
k
)
(5,\,k)
(
5
,
k
)
and vector
N
\mathbf{N}
N
has components
(
k
,
5
)
(k,\,5)
(
k
,
5
)
in Cartesian coordinates. If the magnitude of
M
+
N
\mathbf{M}+\mathbf{N}
M
+
N
is equal to the magnitude of
M
−
N
\mathbf{M}-\mathbf{N}
M
−
N
, the value of
k
k
k
is a)
−
5
-5
−
5
b)
10
10
10
c)
0
0
0
d)
5
5
5
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