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