In the Absence of Air Resistance,the Least Speed with Which $\times$

question 4

Multiple Choice

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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