Find a vector of magnitude 5 units, and parallel to the resultant of the vectors
ˆ
ˆ
ˆ
ˆ
ˆ
ˆ
2
3
  and  
2
a
i
j
k
b
i
j
k
=
+
−
= −
+
r
r 7 If 
ˆ
ˆ
ˆ
ˆ
ˆ
ˆ
ˆ
ˆ
ˆ
,  
2
3
and   
2
a
i
j
k
b
i
j
k
c
i
j
k
= +
+
=
−
+
= −
+
r
r
r
, find a unit vector parallel
to the vector 2
–  
3
a
b
r+c
r
r 8