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Make the following assumptions:

-- Ignore air resistance ===> all objects fall at the same rate, i.e. same distance in the same time.

-- It drops from a stand-still ... nobody throws it down.

x = 1/2 G t2

t = sqrt( 2x / G ) = sqrt(140/32.2) = sqrt(4.348) = 2.085 seconds (rounded)

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Q: How long does it take a penny to drop 70 feet?
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