\[(a)\;0.79 \;cm \quad (b)\;0.1\;cm \quad (c)\;1\;cm \quad (d)\;2\;cm \]

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For a spring $kx=mg$

$x=\large\frac{mg}{k}$

$\quad= \large\frac{GMm}{k r^2}\qquad$$ \bigg[g= \large\frac{GM}{r^2}\bigg]$

$x\; \alpha \; \large\frac{1}{r^2}$

$\large\frac{x_2}{x_1}=\frac{R^2}{(R+h)^2}$

$x^2 =1 \times \bigg(\large\frac{6400}{7200}\bigg)^2$

$\quad= 0.79 \;cm$

Hence a is the correct answer.

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