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The points with position vectors `60hati+3hatj,40hati-8hatj, 40hati-8hatj,ahati-52hatj` are collinear iff (A) `a=-40` (B) `a=40` (C) `a=20` (D) none of these

A

`-20`

B

40

C

`-40`

D

20

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AAKASH INSTITUTE-VECTOR ALGEBRA-ASSIGNMENT (SECTION-B)
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  10. Let veca,vecb and vecc are three vectors such that |veca|=3, |vecb|=3,...

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  11. If veca=hati+hatj+hatk, vecb=4hati+3hatj+4hatk and vecc=hati+alphahatj...

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  12. Let veca=2hati=hatj+hatk, vecb=hati+2hatj-hatk and vecc=hati+hatj-2hat...

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  18. If veca , vecb, vecc are the position vectors of the vertices. A,B,C ...

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  19. If vecpxxvecq=vecr and vecp.vecq=c, then vecq is

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  20. If veca=hati+hatj+hatk, veca.vecb=1 and vecaxxvecb=hatj-hatk then vecb

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