Choose the correct options for the following questions.
The modulus of a vector i-j+k is:
Difficulty: Easy
A:
$\sqrt{3}$
B:
1
C:
$\sqrt{2}$
D:
infinity
If G is the centroid of the triangle, then GA+GB+GC=
Difficulty: Easy
A:
0
B:
1
C:
-1
D:
3
If u=2i-7j, v=i-6j and w=-i+j, then 2u-3v+4w equals:
Difficulty: Easy
A:
8i-3j
B:
3i-5j
C:
2i-3j
D:
-3i+8j
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