Question 414438: Neglecting air resistance, the number of feet s that an onject fall from rest during t seconds is give by the formula s+16tsquared. How long would it take an object to reach the earth if it is dropped from 12,000 feet?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! Neglecting air resistance, the number of feet s that an onject fall from rest during t seconds is give by the formula s(t) = -16tsquared + h. How long would it take an object to reach the earth if it is dropped from 12,000 feet?
------
s(t) = -16t^2 + h where s(t) is the height after t seconds and h is
the initial height.
----
The height is zero when the object hits the ground.
-------------------
Solve -16t^2 + 12000 = 0
-16t^2 = -12000
t^2 = 12000/16
t = sqrt(12000)/4
t = 27.39 seconds
=====================
Cheers,
Stan H.
|
|
|
