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.

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