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Three particles each of mass m are place...

Three particles each of mass m are placed at the corners of a right angled triangle as shown in figure if OA=a and OB=b, the position vector of the centre of mass is:
.

A

`1/3(a hatI+bhatJ)`

B

`1/3(ahatI-bhatJ)`

C

`1/2(ahatI-hatJ)`

D

`1/2(ahati+bhatj)`.

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