The heights of a rock after t seconds, when propelled straight up with an initial speed of 80 feet per second from an initial height of 20 feet, can be modeled by the function s(t) = -16t² + 80t +20. When will the height of the rock be 50 feet? Round your answer to the nearest tenth of a second.

The heights of a rock after t seconds, when propelled straight up with an initial speed of 80 feet per second from an initial height of 20 feet, can be modeled by the function s(t) = -16t² + 80t +20. When will the height of the rock be 50 feet? Round your answer to the nearest tenth of a second.

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter4: Two-and-three Dimensional Motion

Section: Chapter Questions

Problem 45PQ: Pete and Sue, two reckless teenage drivers, are racing eastward along a straight stretch of highway....

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Distance and Speed

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The heights of a rock after t seconds, when propelled straight up with an initial speed of 80 feet per
second from an initial height of 20 feet, can be modeled by the function s(t) = -16t² + 80t +20.
When will the height of the rock be 50 feet? Round your answer to the nearest tenth of a second.
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