Question

find a vector perpendicular to a=2i+4j whose length along Yaxis is 5 units.

Answer 1

Answer:

b=-10i+5j

Step-by-step explanation:

Given a=2i+4j+0k

LET

as given the length along y axis is 5 then

b=xi+5j  is the vector perpendicular to a

hence if two vector are perpendicular their scalar product is=0

hence a.b=0

so

2x+20=0

x=-10

hence required vector is

b=-10i+5j

Answer 2

Step-by-step explanation:

find a vector perpendicular to a=2i+4j whose length along Yaxis is 5 units.