A body of mass m is projected from the earth's surface at the point of launch, the acceleration of free fall is g and the radius of earth is Re. To escape from the gravitational field of the earth, the speed of the body (i.e. escape velocity) must be at least:
Correct answer: C. Option C
- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation
Option C is correct since it is the correct formula.
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About Gravitation
Newton’s law of universal gravitation relates the force between masses to their masses and separation, while gravitational field strength explains weight and orbital motion. The topic covers satellite velocity and period, escape ideas, weightlessness in free fall, and artificial gravity, which differs from ordinary gravitational attraction.
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