In the absence of air resistance, the least speed with which a body must be projected vertically upward from Earth's surface (m_e = 5.99 $\times$ 10²⁴ kg, R_e = 6.37 $\times$ 10⁶ m) if it is to reach an altitude of 800 km is A) ~1.39 $\times$ 10⁷ m/s B) ~3.73 $\times$ 10³ m/s C) ~1.57 $\times$ 10⁷ m/s D) ~3.96 $\times$ 10³ m/s E) None of these is correct.

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The Answer of In the absence of air resistance, the least speed with which a body must be projected vertically upward from Earth's surface (m_e = 5.99 $\times$ 10²⁴ kg, R_e = 6.37 $\times$ 10⁶ m) if it is to reach an altitude of 800 km is A) ~1.39 $\times$ 10⁷ m/s B) ~3.73 $\times$ 10³ m/s C) ~1.57 $\times$ 10⁷ m/s D) ~3.96 $\times$ 10³ m/s E) None of these is correct.

In the Absence of Air Resistance, the Least Speed with Which