SOLUTION: A pebble is hurdled upward from the top of a 1120-foot-tall building with an initial velocity of 144 feet per second. Neglecting air resistance, the height h(t) in feet of the pebb
Algebra.Com
Question 602466: A pebble is hurdled upward from the top of a 1120-foot-tall building with an initial velocity of 144 feet per second. Neglecting air resistance, the height h(t) in feet of the pebble after t seconds is given by the polynomial function:
h(t)=-16t squared + 144t + 1120
When will the pebble hit the ground?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A pebble is hurled upward from the top of a 1120-foot-tall building with an initial velocity of 144 feet per second. Neglecting air resistance, the height h(t) in feet of the pebble after t seconds is given by the polynomial function:
h(t)=-16t squared + 144t + 1120
When will the pebble hit the ground?
Ans: When h(t) = 0
Solve: -16t^2+144t+1120 = 0
Factor:
-16(t^2-9t-70) = 0
----
t^2-9t-70 = 0
Factor:
(t-14)(t+5) = 0
Ans: time = 14 seconds
===========================
Cheers,
Stan H.
============================
RELATED QUESTIONS
A ball is thrown vertically upward from the top of a building 144 feet tall with an... (answered by KnightOwlTutor)
A ball is thrown upward from the top of a building 80 feet tall with an initial velocity... (answered by ankor@dixie-net.com)
an object is thrown upward from the top of a 144-foot building with a initial velocity of (answered by josmiceli)
An object is thrown upward from the top of a 144-foot building with and initial velocity... (answered by ewatrrr)
If a rock is thrown upward with an initial velocity of 40 feet per second from the top of (answered by user_dude2008)
An object is thrown upward from the top of a 160-foot building with an initial... (answered by ankor@dixie-net.com)
An arrow is shot directly upward from the top of a 112-foot tall building with an initial (answered by stanbon)
An object is thrown upward from the top of a 260 foot tall building with an initial... (answered by solver91311)
A waterfall has a height of 1300 ft. A pebble is thrown upward from the top of the falls... (answered by solver91311)