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In 'coin on card' experiment a smooth card is used. ​
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In 'coin on card' experiment a smooth card is used. ​

User Stamenkovski
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In three words I can sum up everything I’ve learned about life: it goes on. ― Robert Frost

User Erik Funkenbusch
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In coin card experiment smooth card is used so that the card can slide easily from glass

User Fahad Rauf
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