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1 किग्रा द्रव्यमान की गेंद 2 मीटर लम्बी रस्सी के एक सिरे से बाँधी है। इसे उर्ध्वार्धर वृत्त में घुमाया जा रहा है। यदि `g=10"मीटर /सेकण्ड"""^(2)` हो तो वृत्त के निम्नतम बिन्दु पर गेंद की न्यूनतम चाल क्या है ?
A. 10 मीटर/सेकण्ड
B. 12 मीटर/सेकण्ड
C. 15 मीटर/सेकण्ड
D. 20 मीटर/सेकण्ड

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