Universal law of gravitation, escape velocity, Kepler's laws (basic).
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Q1 · Gravitation · EASY
The value of acceleration due to gravity on the surface of Earth is approximately:
Q2 · Gravitation · MEDIUM
The escape velocity from Earth's surface is approximately:
Q3 · Gravitation · HARD
At what height above the Earth's surface will the acceleration due to gravity be 4 m/s²? (Take g = 10 m/s² and radius of Earth R = 6400 km):