9.A rocket is launched vertically upward at velocity v around the surface of Earth. The constant of universal gravitation, the radius of Earth, and the mass of Earth are G,
, respectively. Neglect the air resistance and friction. What is the maximum height it can reach?
(A)
(B)
(C)
(D)
(E)
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統計: A(1), B(0), C(0), D(1), E(3) #3427009
統計: A(1), B(0), C(0), D(1), E(3) #3427009