A new planet has been discovered ad given the name Planet X . The mass of Planet X estirated to be one-half that of Earth; and the radius of Planet X is estimated to be twice that of Earth The acceleration due to gravity on the surface of Planet X is gx: The acceleration due to gravity on the surface of Earth is 9E- Which of the following is correct expression? {9e 9x = #9e 9x = {91 9x = YE 29E



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