44. A planet has the same mass as the Earth. It also has a radius twice the Earth’s radius. If the Earth’s acceleration due to gravity is g, what is the acceleration due to gravity on the planet’s surface?
(A) 1/4 g
(B) 1/2 g
(C) g
(D) 2 g

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統計： A(2), B(2), C(3), D(0), E(0) #347731