If a body starts from rest and travels 120

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If a body starts from rest and travels $120 \,cm$ in the $6^{th}$ second, then what is the acceleration.........$m/{s^2}$

A

$0.20 $

B

$0.027$

C

$0.22$

D

$0.03 $
If a body starts from rest and travels $120 \,cm$ in the $6^{th}$ second, then what is the acceleration.........$m/{s^2}$
${S_n} = u + \frac{a}{2}(2n - 1)$
$⇒$ $1.2 = 0 + \frac{a}{2}(2 \times 6 - 1)$
$⇒$  $a = \frac{{1.2 \times 2}}{{11}} = 0.218\;m/{s^2}$