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July 28, 2014

July 28, 2014

Posted by **stacy** on Sunday, September 26, 2010 at 9:51pm.

- Physics -
**MathMate**, Sunday, September 26, 2010 at 10:17pmThe bill is about 7 cm. high.

So David has to catch it before it falls through 7cm, assuming David's fingers are right below Emily's.

Here,

g=-9.8 m/s²

S=-0.07m

initial velocity, u =0

S=ut+(1/2)gt²

Solve for t to see if it exceeds 0.2 s.

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