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If ` vec a , vec b` are the position vectors of the points `(1,-1),(-2,m),` find the value of `m` for which ` vec aa n d 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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  12. Find the all the values of lamda such that (x,y,z)!=(0,0,0)and x(hati+...

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  13. The number of integral values of p for which (p+1) hati-3hatj+phatk, p...

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  14. If vectors vec(AB) = -3hati+ 4hatk and vec(AC) = 5hati -2hatj+4hatk ar...

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  15. In the figure, a vectors x satisfies the equation x+w=v. then, x is eq...

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