Question

resultant of two vectors a=3i+4j and b=ai+3j lies along y axis. the value of a is

Answer 1

Answer:

Explanation:I hope it helps .

Answer 2

a=3

B - A =ai+3j - (3i+4j)

        = ai+3j - 3i - 4j

        = (a-3)i-1j

since resultant is on y axis., therefore,,

ai-3i=0

i.e. a=3