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1 किग्रा द्रव्यमान का एक पत्थर 5 मीटर लम्बी डोरी से बांधकर उधर्व वृत्त में घुमाया जाता है। वृत्त के उच्चतम बिन्दु पर पत्थर की न्यूनतम चाल क्या है ? `(g=9.8"मीटर /सेकण्ड"""^(2))`
A. 5 मीटर/सेकण्ड
B. 7 मीटर/सेकण्ड
C. `7sqrt5` मीटर/सेकण्ड
D. `5sqrt7` मीटर/सेकण्ड

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