Three identical spheres, each of mass $1\ kg$ are placed touching each other with their centres on a straight line. Their centres are marked $K, L$ and $M$ respectively. The distance of centre of mass of the system from $K$ is
Three identical spheres, each of mass $1\ kg$ are placed touching each other with their centres on a straight line. Their centres are marked $K, L$ and $M$ respectively. The distance of centre of mass of the system from $K$ is
- A
$\frac{{KL + KM + LM}}{3}$
- B
$\frac{{KL + KM}}{3}$
- C
$\frac{{KL + LM}}{3}$
- D
$\frac{{KM + LM}}{3}$
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