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8 September, 15:24

A pebble drops from a balcony that is 160 feet above the ground. The pebble lands on the top of a sign that is 16 feet high. The function y=160-16t^2 represents the height y (in feet) of the pebble t seconds after dropping from the balcony. How many seconds does the pebble drop before hitting the sign?

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  1. 8 September, 18:01
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    3 seconds

    Step-by-step explanation:

    16 = 160 - 16t²

    16t² = 144

    t² = 9

    t = 3
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