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in Physics by (25.0k points)
द्रव्यमान m का एक उपग्रह पृथ्वी - तल से `R_e ` ऊँचाई पर पृथ्वी के परितः घूम रहा है | यदि पृथ्वी - तल का गुरुत्वीय त्वरण g हो तथा पृथ्वी की त्रिज्या `R_e ` हो, तो उपग्रह की गतिज ऊर्जा होगा :
A. ` mg R_e//4 `
B. `mg R_e //2 `
C. `mg R_e `
D. `2 mg R_ e`.

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