Time of a flight.

[kelly1]

Another word problem. Any help is greatly appreciated!!


When Johnson reached a speed of 32 ft/sec on the pole vault runway, his height above the ground t seconds after leaving the ground was given by h=-16t^2+32t. Find the value of t for which his height was 12 ft. Using this information, determine how long Johnson was in the air and for how long was he more than 14 ft. in the air? Thanks!!

 

[stapel]

Find the value of t for which his height was 12 ft.

So you've plugged in the given value for the height, solved the quadratic equation, and... where are you stuck?

Using this information, determine how long Johnson was in the air...

So you've plugged in "zero" for the height, solved the quadratic equation, and... where are you stuck?

...and for how long was he more than 14 ft. in the air?

So you've plugged in the given value for the height, solved the quadratic equation, and... where are you stuck?

Please reply showing all of the steps and reasoning you have tried thus far.

Thank you.

Eliz.

 

[jolly]

Why even bother with this person? This is very disrespectful and kelly1 is taking advantage of freemathhelp.com. It's a disgrace! Kelly1 you have some nerve! I wish I could report you to whoever assigned these problems to you. :x

 

[Mrspi]

Not to worry....

Hey, Jolly....


It's true that Kelly has posted 21 problems. It's also true that s/he has not received even ONE answer to those problems. S/he has received some helpful suggestions as to how to solve the problems. And, so far as I can see, there hasn't been one response from Kelly showing his/her work.

So, I wouldn't worry about all of this....we aren't doing the student's homework. Not a big deal, in my estimation.

I guess some students will try anything.....