A 2 kg body falls from infinity to the surface of earth. What will be the kinetic energy of the body on reaching the surface of Earth (Assume escape velocity to be 104 ms-1)?
Correct answer: A. 108J
- A. 108J
- B. 1016 J
- C. 1020 J
- D. 1024 J
Explanation
The following is the solution: Kinetic energy = 1/2 mvo2 = 1/2 x 2 (104)2 = 108 J
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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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