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If vec a , vec b are the position vecto...

If ` vec a , vec b` are the position vectors of the points `(1,-1),(-2,m),` find the value of `m` for which ` vec a and vec b` are collinear.

A

4

B

3

C

2

D

0

Text Solution

Verified by Experts

The correct Answer is:
C
Condition for collinearly, `b=lamda=a`
`implies(-2hati+mhatj)=lamda(hati-hatj)`
Comparison of coefficient, we get
`implies lamda=-2 and -lamda=m`
so, m=2
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