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The centripetal force on a 0.82kg object on the end of a 2.0m massless string being

The centripetal force on a 0.82kg object on the end of a 2.0m massless string being swung in a horizontal circle is 4.0N. What is the tangential velocity of the object?

Use:

$F = \frac{mv^2}{r}$

and find v.

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