A projectile is launched straight up from ground level with an initial velocity of 96 ft per sec. Its height in feet, s, after t seconds is given by the equation s = -16t + 96t. (a) At what time(s) will it reach a height of 80 ft? (b) After how many seconds will it return to the ground?

Algebra and Trigonometry (6th Edition)
6th Edition
ISBN:9780134463216
Author:Robert F. Blitzer
Publisher:Robert F. Blitzer
ChapterP: Prerequisites: Fundamental Concepts Of Algebra
Section: Chapter Questions
Problem 1MCCP: In Exercises 1-25, simplify the given expression or perform the indicated operation (and simplify,...
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A projectile is launched straight up from ground level with an initial velocity of 96 ft per sec. Its height
in feet, s, after t seconds is given by the equation s = -16t + 96t.
(a) At what time(s) will it reach a height of 80 ft?
(b) After how many seconds will it return to the ground?
Transcribed Image Text:A projectile is launched straight up from ground level with an initial velocity of 96 ft per sec. Its height in feet, s, after t seconds is given by the equation s = -16t + 96t. (a) At what time(s) will it reach a height of 80 ft? (b) After how many seconds will it return to the ground?
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