Question

A VECTOR Q WHICH HAS A MAGNITUDE OF 8 UNITS IS ADDED TO A VECTOR P WHICH LIES ALONG THE X AXIS .THE RESULTANT OF TWO VECTOR LIES ALONG THE Y AXIS .IF THE MAGNITUDE OF THE RESULTANT IS TWICE THAT OF P THEN MAGNITUDE OF P WILL BE

Answer 1

Answer:

Let unit vector along x and y axes by i and j respectively

According to question

8 + Bi = 2Bj

8 = 2Bj - Bi

8 = sqrt((2B)^2 + B^2)

8 = sqrt(5B^2)

8 = Bsqrt(5)

B = 8 / sqrt(5)

answer by UrsAnnabelle :)