Question

A coin kept on a postcard on the glass,drop in the glass when the postcard is fipped suddenly.​

Answer 1

Answer:

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Explanation:

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Answer 2

Answer:

When you flick the card out from under the penny, you allow gravity (an outside force) to act on it and drop it into the glass. The bottom of the glass stops the penny from falling. ... If you flick the card correctly, it simply slides out from between the glass and the penny.