\[(a)\;127008\;km/hr^2\quad (b)\;227008\;km/hr^2 \quad (c)\;157008\;km/hr^2\quad (d)\;none\;of\;these\]

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$n_1=n_2\bigg[\large\frac{L_2}{L_1}\bigg] \bigg[\large\frac{T_2}{T_1}\bigg]^{-2}$

$n_2=9.8$

Therefore $n_1=9.8\bigg[\large\frac{1m}{1km}\bigg] \bigg[\frac{1 sec}{1 hr}\bigg]^{-2}$

$\qquad=9.8 \bigg[\large\frac{1m}{1000 m}\bigg] \bigg[\large\frac{1 sec}{60 \times 60 sec}\bigg]$

$\qquad=9.8 \times \bigg[\large\frac{36 \times 36 \times 104}{1000 }\bigg]$

$n_1=127008 km/hr^2$

Hence a is the correct answer.

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