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If vecR is the position vector of the ce...

If `vecR` is the position vector of the centre of mass, then express the same in terms of product 'mr' of all the particles and mass M of the rigid body.

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`vecR=(summ_ivecr_i)/(M)` Where `vecr_i=x_ihati+y_ihatj+z_ihatk` and `vecR_(CM)=xhati+yhatj+zhatk`
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