阿摩線上測驗
3. A rocket is fired vertically with half the "escape speed". (Ignore the earth's rotation) What is its maximum altitude in terms of the earth RE?
(A) RE；
(B) RE/2 ；
(C) RE/3；
(D) RE/4 ；
(E) None.
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統計： A(0), B(2), C(0), D(0), E(0) #3188034
統計： A(0), B(2), C(0), D(0), E(0) #3188034
