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29 July, 11:17

3. You are walking in Paris alongside the Eiffel Tower and suddenly a croissant smacks you on the head and knocks you to the ground. From your handy dandy tourist guidebook you find that the height of the Eiffel Tower is 300.5 m. If you neglect air resistance, calculate how many seconds the croissant dropped before it tagged you on the head.

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  1. 29 July, 12:16
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    As absurd as the concept is, we must assume that a croissant

    can fall 300.5 meters through the moisture-laden, perfumed and

    polluted Parisian air with no air resistance whatsoever.

    Acceleration due to gravity on Earth: 9.8 m/s²

    Distance in clean,

    unimpeded free-fall = (1/2) (acceleration) x (time²)

    300.5 m = (1/2) (9.8 m/s²) (T²)

    Divide each side

    by (4.9 m/s²) : (300.5 m) / (4.9 m/s²) = T²

    Take the square root

    of each side: T = √ (300.5/4.9) (s²)

    = 7.831 seconds.
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