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Two masses 2kg and 5kg are placed at poi...

Two masses `2kg` and `5kg` are placed at points `'A'` and `'B'` as shown in the figure

`vecOA=2hati+3hatj`
`vecAB=5hati+8hatj`
Find the co-ordinates of centre of mass.

A

`((39)/(7),(61)/(7))`

B

`((36)/(7),(58)/(7))`

C

`((39)/(7),(63)/(7))`

D

`((29)/(7),(61)/(7))`

Text Solution

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Knowledge Check

  • If in the shown figure AC=hati+2hatj+4hatk and BD=hati-3hatj+hatk then BC is

    A
    `3/2hati-1/2hatj+5hatk`
    B
    `hati-1/2hatj+5/2hatk`
    C
    `2hati-hatj+5hatk`
    D
    `3/3hati-2hatk+3hatk`

  • The two vectors A=2hati+hatj+3hatk and B=7hati-5hatj-3hatk are -

    A
    parallel
    B
    perpendicular
    C
    anti-parallel
    D
    none of these

  • if a=2hati+hatj+2hattk and b=5hati-3hatj+hatk , then the projection of 'b' and 'a' is

    A
    3
    B
    4
    C
    5
    D
    6

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