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in Physics by (25.0k points)
एक पिण्ड पृथ्वी - तल से `R_e ` दूरी (पृथ्वी की त्रिज्या ) पर विरामावस्था में है | इसे ऊर्ध्वाधर ऊपर फेंके जाने का न्यूनतम वेग जिससे कि यह पृथ्वी पर कभी लौटकर न आये , होगा :
A. ` sqrt ((GM_e)/(4R_e)) `
B. `sqrt((GM_e)/(2R_e)) `
C. `sqrt ((GM_e )/(R_e)) `
D. `sqrt ((2GM_e )/(R_e )) `

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