A rock is thrown off a bridge into the water. The path of the rock can be modeled by the function h=-4.9t^2 +18t +15 where h=height in metres and t=time in seconds. a. When will the rock hit the water? b. For how long will the rock be above 20m? c. What is the maximum height that the rock reaches?

A rock is thrown off a bridge into the water. The path of the rock can be modeled by the function h=-4.9t^2 +18t +15 where h=height in metres and t=time in seconds. a. When will the rock hit the water? b. For how long will the rock be above 20m? c. What is the maximum height that the rock reaches?

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter9: Quadratic Functions And Equations

Section9.6: Solving Quadratic Equations By Using The Quadratic Formula

Problem 64PFA

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A rock is thrown off a bridge into the water. The path of the rock can be modeled by the function h=-4.9t^2 +18t +15 where h=height in metres and t=time in seconds.

a. When will the rock hit the water?

b. For how long will the rock be above 20m?

c. What is the maximum height that the rock reaches?

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