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If the position vector of the i^(th) par...

If the position vector of the `i^(th)` particle is `x_1=x_i+y_ihatj+zhatk`, then represent the centre of mass of such a system.

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`vecR=(overset(n)underset(i=1)summ_ivecr_i)/(M)` where `vecR=Xhati+Yhatj+Zhatk`
where `X=1/Mint xdm,Y=1/Mint ydm` and `Z=1/Mint zdm`
and `M=int dm`.
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