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AA12. A vector X, when added to two vectors A = 3i -5j +7kand B-2i+4i-3k gives a unit vector along Y-axis astheir resultant. Find the vector X.[Ans. - 51 +29-48

Answer»

It is given in question that resultant vector R is unit vector along y-axis. So, R = 0i + j + 0k.

A + B + X = RX = R -( A + B)= 0i + j + 0k -( 3i -5j + 7k + 2i +4j-3k)= 0i + j + 0k -5i +j -4k= -5i +2j -4k (Ans)



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