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If a projectile is launched vertically upward from the ground with an initial velocity of 90 ft per sec, neglecting air resistance, its height s (in feet) above the ground t seconds after projection is given by s= - 161 + 90t. Which equation should be used to determine the time at which the height of the projectile reaches 20 ft? Choose the correct answer below. O A. s= - 16(20)² + 90 O B. 20= - 16t + 90t O C. 20= -16t Click to select wour answer 10:36 AM 2/19/202

If a projectile is launched vertically upward from the ground with an initial velocity of 90 ft per sec, neglecting air resistance, its height s (in feet) above the ground t seconds after projection is given by s= - 161 + 90t. Which equation should be used to determine the time at which the height of the projectile reaches 20 ft? Choose the correct answer below. O A. s= - 16(20)² + 90 O B. 20= - 16t + 90t O C. 20= -16t Click to select wour answer 10:36 AM 2/19/202

Algebra and Trigonometry (6th Edition)
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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If a projectile is launched vertically upward from the ground with an initial velocity of 90 ft per sec, neglecting air resistance, its height s (in feet) above the ground t seconds after projection is given by s= - 161" + 90t. Which equation should be used to determine the time ai which the height of the projectile reaches 20 ft? Choose the correct answer below. O A. s= - 16(20) + 90 O B. 20= - 16t +90t O C. 20= -16t Click to select wour answer 10:36 AM 2/19/202
Transcribed Image Text:If a projectile is launched vertically upward from the ground with an initial velocity of 90 ft per sec, neglecting air resistance, its height s (in feet) above the ground t seconds after projection is given by s= - 161" + 90t. Which equation should be used to determine the time ai which the height of the projectile reaches 20 ft? Choose the correct answer below. O A. s= - 16(20) + 90 O B. 20= - 16t +90t O C. 20= -16t Click to select wour answer 10:36 AM 2/19/202
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S=-16t^2+90t 

We have to determine the time at which the height of the projectile reaches 20 ft

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