SOLUTION: A penny is dropped off the Empire State Building which is 1250 feet tall. If the penny's pathway can be modeled by the equation h=-16t^2+1250, how long would it take the penny to s

Algebra ->  Coordinate Systems and Linear Equations  -> Lessons -> SOLUTION: A penny is dropped off the Empire State Building which is 1250 feet tall. If the penny's pathway can be modeled by the equation h=-16t^2+1250, how long would it take the penny to s      Log On


   

Question 1156022: A penny is dropped off the Empire State Building which is 1250 feet tall. If the penny's pathway can be modeled by the equation h=-16t^2+1250, how long would it take the penny to strike a 6 foot tall person?
Found 2 solutions by BlGDAVE, ikleyn:
Answer by BlGDAVE(19) About Me  (Show Source):
Answer by ikleyn(52783) About Me  (Show Source):
You can put this solution on YOUR website!
.

They want you solve this quadratic equation


    h(t) = 6,  which is  -16t^2 + 1250 = 6,


    16t^2 = 1250-6 = 1244


     t^2 = 1244%2F16 = 77.75


     t = sqrt%2877.75%29 = 8.82 seconds (approximately).    ANSWER

Solved.

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    - 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

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    - 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

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