AP Physics 1mediummcq1 pt
A 0.30 kg ball on a 0.60 m string moves in a vertical circle. The minimum speed at the top for the string to stay taut is about (g = 10 m/s²)
A.2.4 m/s
B.6.0 m/s
C.1.8 m/s
D.3.0 m/s
Explanation
Core Concept
At minimum speed, tension is zero and mg = mv²/r, so v = √(gr) = √(6.0) ≈ 2.4 m/s.
Correct Answer
A2.4 m/s
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