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The resultant of two vectors vecA and vecB is perpendicular to vecA and equal to half of the magnitude of vecB. Find the angle between vecA and vecB ?

Answer»

SOLUTION :Since `vecR` is perpendicular to `vecA`. figure SHOWS the three vectors `vecA, vecB and vec`R.
ANGLE between `vecA and vecB` is p-q
`"SIN" q=(R)/(B)=(B)/(2B)=(1)/(2)`
`rArr q=30^(@) rArr` angle between A and B is `150^(@)`


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