SOLUTION: (this is a word problem involving quadratic equation)
an object is projected directly upward from the ground. after t seconds its distance in feet above the ground is s=144t-16r
Algebra.Com
Question 347093: (this is a word problem involving quadratic equation)
an object is projected directly upward from the ground. after t seconds its distance in feet above the ground is s=144t-16r^2 after how many sec. will the object be 128 feet above the ground? (please explain how u got the answer and use the factoring method)
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
an object is projected directly upward from the ground. after t seconds its distance in feet above the ground is s=144t-16r^2 after how many sec. will the object be 128 feet above the ground?
--------------
When the object is on the ground, s=zero.
---
Solve: -16t^2+144t = 0
-16t(t-9) = 0
t = 0 seconds or t = 9 seconds
----
That means the object was on the ground with
time started and is back on the ground after
9 seconds.
=============
Cheers,
Stan H.
RELATED QUESTIONS
Please help me solve this problem: If an object is projected upward with an initial... (answered by richwmiller)
An object is projected directly upward from the ground. After t seconds its distance in... (answered by Alan3354)
An object is projected directly upward from the ground. After t seconds its distance in... (answered by krisitna)
Please help me solve this: If an object is projected upward with an initial velocity of... (answered by Alan3354)
An object is projected directly upward from te ground. After t secconds. the distance (s) (answered by stanbon)
An object is projected directly upward from the ground. After t seconds its distance in... (answered by MathLover1)
if an object is projected upward with an initial velocity off 64 ft per sec from a height (answered by jorel1380,lwsshak3)
The height s of an object projected directly upward from an initial height 𝑠0... (answered by ikleyn)
If an object is projected upward with an initial velocity of 48 ft pe second from a... (answered by ankor@dixie-net.com,Earlsdon)