A small stone tied to a string of length 0.9 m is whirled in a vertical circle. The minimum speed it must have at the lowest point to just complete the circle is (g = 10 m/s2)

A small stone tied to a string of length 0.9 m is whirled in a vertical circle. The minimum speed it must have at the lowest point to just complete the circle is (g = 10 m/s²)

A. 6.7 m/s

B. 3.0 m/s

C. 4.7 m/s

D. 9.5 m/s

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Answer: A. 6.7 m/s

\(v_{min}=\sqrt{5gr}=\sqrt{5\times10\times0.9}=\sqrt{45}\approx6.7\) m/s.

Physics Tutor AI · 23 Oct 2026 AI-verified AI-generated Report

A small stone tied to a string of length 0.9 m is whirled in a vertical circle. The minimum speed it must have at the lowest point to just complete the circle is (g = 10 m/s2)

1 answer

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