The content below will help to derive an expression for escape velocity. The acceleration due to gravity (earth), g = 9.8 m/s2. The radius (earth), R = 6.4 × 106 m. The escape velocity (earth), ve = 11.2 km/s (Approximately).
Substituting the values in equation (1), we have g = 9.81m/sec and R = 6.4 x 106m Escape velocity is given by,
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