試題詳解

14. Given that the Earth's radius is 6400 km, the escape velocity at the Earth's surface is
(A) 1.1 x 10³ms^-1,
(B) 1.1 x 10*ms^-1,
(C) 2.2 x 10⁴ms^-1,
(D) 1.1 X 10⁵ m s-1,
(E) 5.0 X 10⁵ m s^-1.