A particle is projected radially outward from the surface of a planet with speed √(GM/R). Which statements are correct?
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Question

A particle is projected radially outward from the surface of a planet with speed √(GM/R). Which statements are correct?

G1 Physics · Accepted Answer

Initial E=½m(GM/R)−GMm/R=−GMm/(2R)<0, so it cannot escape. At maximum radius speed is zero: −GMm/r_max=−GMm/(2R), giving r_max=2R.