If a body starts from rest and travels $120\,\, cm$ in $6^{th}$ second then the acceleration of body is
- A$\frac{240}{11}\,\, m/s^2$
- B$\frac{120}{11}\,\, m/s^2$
- C$11\,\, cm/s^2$
- D$21.8\,\, cm/s^2$
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