A particle is dropped from a height \( h=3 R \) above earth surface, where \( R \) is the radius....

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A particle is dropped from a height \( h=3 R \) above
P
earth surface, where \( R \) is the radius of earth. If \( g \) is the acceleration due to gravity on earth surface, then speed with which the particle strikes the earth surface is
(1) \( \sqrt{3 g R} \)
(2) \( \sqrt{2 g R} \)
(3) \( \sqrt{1.5 g R} \)
(4) \( \sqrt{g R} \)


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