Question

The component of vector A= 2î+3j along the vector î+j is

Answer 1

A=2i + 3j
B= i+ j

A.B=(2i + 3j) ( i + j )
=2i.i + 2i.j + 3j.i + 3j.j
(i.i=1, j.j=0 ,i.j=0 ,j.i=0)
=2+3
=5