SOLUTION: A ball is thrown from an initial height of 2 meters with an initial upward velocity of 11 m/s. The balls height h (in meters) after t seconds is given by the following h=2+11t-5^

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons -> SOLUTION: A ball is thrown from an initial height of 2 meters with an initial upward velocity of 11 m/s. The balls height h (in meters) after t seconds is given by the following h=2+11t-5^      Log On


   



Question 1130803: A ball is thrown from an initial height of 2 meters with an initial upward velocity of 11 m/s. The balls height h (in meters) after t seconds is given by the following
h=2+11t-5^2
Find all values of t fro which the balls height is 7 meters.

Found 2 solutions by Alan3354, ikleyn:
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
A ball is thrown from an initial height of 2 meters with an initial upward velocity of 11 m/s. The balls height h (in meters) after t seconds is given by the following
h=2+11t-5^2
Find all values of t fro which the balls height is 7 meters.
------------
Find the 2 times when the ball is at 7 meters.
Call them t1 and t2, where t2 > t1
----
t1 < t < t2

Answer by ikleyn(52752) About Me  (Show Source):
You can put this solution on YOUR website!
.
In my post, I simply want to notice that your basic equation is written INCORRECTLY.


The correct form is THIS


    h(t) = 2 + 11t - 5*t^2.


Then solve it as Alan just explained to you.

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To see many other similar solved problems,  look into the lessons
    - Problem on a projectile moving vertically up and down
    - Problem on an arrow shot vertically upward
    - Problem on a ball thrown vertically up from the top of a tower
    - Problem on a toy rocket launched vertically up from a tall platform

Also,  you have this free of charge online textbook in ALGEBRA-I in this site
    - ALGEBRA-I - YOUR ONLINE TEXTBOOK.

The referred lessons are the part of this textbook under the topic "Projectiles launched/thrown and moving vertically up and dawn".


Save the link to this online textbook together with its description

Free of charge online textbook in ALGEBRA-I
https://www.algebra.com/algebra/homework/quadratic/lessons/ALGEBRA-I-YOUR-ONLINE-TEXTBOOK.lesson

to your archive and use it when it is needed.