3
Question
The points whose position vectors are 60i+3j,40i−8j and ai−52j collinear, if
The points whose position vectors are 60i+3j,40i−8j and ai−52j collinear, if
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Solution
The correct option is B a=−40
−−→AB=−20^i−11^j
−−→AC=(a−60)^i−55^j
Vectors are collinear, so,
−20a−60=−11−55
⇒a=−40
−−→AB=−20^i−11^j
−−→AC=(a−60)^i−55^j
Vectors are collinear, so,
−20a−60=−11−55
⇒a=−40
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