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A .400 kg object is swung in a vertical circular path on a string 0.500m long. If it's speed is 4.00 m/s at the top of the circle, what is the tension in the string there?

i drew my free body diagram and have tension pointing up in the positive y direction. the force due to gravity pointing down and the centripitial acceleration pointing down as well. i end up getting something like 8.88 N and the back of the book is showing 13.2 N. Can anyone point out where i went wrong?

TIA...

-andrew

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# Non uniform circular motion?

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