Question

give me answer... focus on the question ​

Answer 1

Answer:

since v1 and v2 are perpendicular ; we must apply dot product here

as a(vector).b(vector)=/a/×/b/cos@

and here v1=a; v2=b

and @=90degree =cos@=0

»v1.v2=0

»(5i+2j).(ai-6j) =0

(5).(a) + (-6).(2)=0

1. a=12/5 (answer)