Gravitational Force, Q no. 56 of NSEP-2022 a first level examination of Physics Olympiad

This Video is a solution of Q no 56 of National Standard Examination of Physics 2022. This question depends upon the topic of Gravitational force. The video is useful for the students who are preparing for the competitive examinations like IIT JEE, NEET and Olympiad.
The link of previous question no. 55 of National Standard Examination of Physics (NSEP) 2022 is as below:
• Optics, Critical Angle...

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Thank you sir

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Equation of motion is applied on constant accelerating body! The equation varies with r then how can we just simply apply equation of motion