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A body starts from rest at a point, distance \( \mathrm{R}_{0} \) from the centre of the earth of mass \( M \), radius \( R \). The velocity
W acquired by the body when it reaches the surface of the earth will be
(a) \( \mathrm{GM}\left(\frac{1}{\mathrm{R}}-\frac{1}{\mathrm{R}_{0}}\right) \)
(b) \( 2 \mathrm{GM}\left(\frac{1}{\mathrm{R}}-\frac{1}{\mathrm{R}_{0}}\right) \)
(c) \( \sqrt{2 \mathrm{GM}\left(\frac{1}{\mathrm{R}}-\frac{1}{\mathrm{R}_{0}}\right)} \)
(d) \( 2 \mathrm{GM} \sqrt{\left(\frac{1}{\mathrm{R}}-\frac{1}{\mathrm{R}_{0}}\right)} \)
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