A particle falls from infinity to the earth. Its velocity on reaching the earth surface is : (1)...

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A particle falls from infinity to the earth. Its velocity on reaching the earth surface is :
(1) \( 2 \mathrm{Rg} \)
(2) \( \mathrm{Rg} \)
(3) \( \sqrt{\mathrm{Rg}} \)
(4) \( \sqrt{2 \mathrm{Rg}} \)
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