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The vectors of bar(AB)=3bar(i)+4bar(k) a...

The vectors of `bar(AB)=3bar(i)+4bar(k) and bar(AC)=5bar(i)-2bar(j)+4bar(k)` are the sides of a triangle ABC. The length of the median through A is

A

`sqrt(72)`

B

`sqrt(33)`

C

`sqrt(288)`

D

`sqrt(18)`

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The correct Answer is:
B
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AAKASH SERIES-PROPERTIES OF VECTORS-EXERCISE - II
  1. The P.V.'s of A, B, C are bar(i)+bar(j)+bar(k), 4bar(i)+bar(j)+bar(k),...

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  2. In a DeltaABC, P.V.'s of midpoints of AB, AC are bar(i)-bar(j)+bar(k),...

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  3. The vectors of bar(AB)=3bar(i)+4bar(k) and bar(AC)=5bar(i)-2bar(j)+4ba...

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  4. If D, E, F are the midpoints of BC, CA, AB of Delta ABC, then vec(A)D ...

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  5. If D, E and F are respectively the mid-points of AB, AC and BC in Delt...

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  6. If ABCD is a parallelogram then bar(AC)+bar(BD)=

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  7. ABCD is a parallelogram, with AC, BD as diagonals, then overset(-)(AC)...

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  8. OACB is a parallelogram with bar(OC)=bar(a), bar(AB)=bar(b)" then "bar...

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  9. If the diagonals of a parallelogram are bar(i)+5bar(j)-2bar(k) and -2b...

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  10. ABCD is a quadrilateral. E is the point of intersection of the line jo...

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  11. ABCDE is a pentagon then bar(AB)+bar(AE)+bar(BC)+bar(DC)+bar(ED)+bar...

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  12. ABCDEF is a regular hexagon. If bar(AB)+bar(AE)+bar(BC)+bar(DC)+bar(...

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  13. ABCDEF is a regular hexagon. bar(AB)+bar(AC)+bar(AD)+bar(EA)+bar(FA)...

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  14. ABCDEF is a regular hexagon. If bar(AB)=bar(a), bar(BC)=bar(b)" then...

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  15. ABCDEF is a regular hexagon. If bar(AB)=bar(a), bar(BC)=bar(b)" then...

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  16. ABCDEF is a regular hexagon. O is centre and P.V. of A, B are bar(i)...

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  17. If OABC, OCDE, OEFA are adjacent faces of a cube OABCDEF then bar(OB)+...

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  18. If I is the centre of a circle inscribed in a DeltaABC, then abs(bar(B...

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  19. If bar(r)=3bar(p)+4bar(q)" and "2bar(r)=bar(p)-3bar(q) then

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  20. If bar(e)=lbar(i)+mbar(j)+nbar(k) is a unit vector then maximum value ...

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