Question

If a body starts from rest and travels 120 cm in the 6^th second, then what is the acceleration

• A. 0.20 $m/s^{2}$
• B. 0.027 $m/s^{2}$
• C. 0.218 $\mathbf{m/}\mathbf{s}^{\mathbf{2}}$
• D. 0.03 $m/s^{2}$

Answer 1

Answer: (C)

0.218 $\mathbf{m/}\mathbf{s}^{\mathbf{2}}$

Answer 2

$S_{n} = u + \frac{a}{2}(2n - 1)$ ⇒ $1.2 = 0 + \frac{a}{2}(2 \times 6 - 1)$

⇒ $a = \frac{1.2 \times 2}{11} = 0.218\mspace{6mu} m/s^{2}$