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# Question for Physics homework?

The mass of a ball in being spun in a vertical circle is 0.10 kg and the string is 45 cm long. If the tension in the string when the ball is at the top of the circle is 5.75 N, what is the speed of the ball at that location?

### 1 Answer

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- FiremanLv 72 months agoFavorite Answer
At the top position:

=>T + mg = mv^2/r

=>T = m[v^2/r - g]

=>5.75 = 0.10 x [v^2/0.45 - 9.8]

=>v = √30.29

=>v = 5.50 m/s

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