The sum of magnitude of two vectors is 18

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The sum of two vectors is 18 unit and smaller one has magnitude 5 units. If resultant is at 90° with smaller vector then magnitude of their resultant is

Answer: 12 units

Answered by admin @


Answer:

let r be resultant vector

given

r=√(x1^2+x2^2+2x1x2cos90°)

r=√(5^2+x2^2+0). { cos90°=0}

r=√(25+x2^2)

squaring on both sides

r^2=25+x2^2


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