Question 109037
If the balloonist of Exercise 83 throws his sandbag downward from an altitude of 128 feet with an initial velocity of 32 feet per second, then its altitude after t seconds is given by the formula h=-16t^2-32t+128.  How long does it take for the sandbag to reach the earth?
------------------------
It's height is zero when it hits the ground so let h=0
-----------------
-16t^2-32t+128 = 0
t^2+2t-8 = 0
(t+4)(t-2)=0
Positive answer:
t = 2 seconds
==================
Cheers,
Stan H.