The average radii of orbits of mercury and earth around the sun are \( 6 \times 10^{7} \mathrm{~...

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The average radii of orbits of mercury and earth around the sun are \( 6 \times 10^{7} \mathrm{~km} \) and \( 1.5 \times 10^{8} \mathrm{~km} \) respectively. The ratio of their orbital speeds will be :-
(1) \( \sqrt{5}: \sqrt{2} \)
(2) \( \sqrt{2}: \sqrt{5} \)
(3) \( 2.5: 1 \)
(4) \( 1: 25 \)
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