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a girl whirls a stone of mass 0.5kg in a vertical circle on the end of a string 40cm long.at the lowest point of the circle of the circle, the velocity of the stone is 3m/s.calculate the tension on the string at this point?

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T=mv²/r +Mg 
T=0.5×3²/0.4 +0.5×10
T=61.25N 
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