A Space Rocket Is Launched Such That Very Far from Earth

question 14

Multiple Choice

A space rocket is launched such that very far from Earth it has a speed of 20 km/s.What was its initial launch speed from the surface of Earth? (R_E = 6.38 $\times$ 10⁶ m,M_E = 5.98 $\times$ 10²⁴ kg,G = 6.67 $\times$ 10^-11 N·m²/kg²)

• A)22.9 km/s
• B)20.0 km/s
• C)45.8 km/s
• D)21.5 km/s
• E)25.5 km/s

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