17. The height of an object dropped from a hot-air balloon can be determined by the formula
h = -16r2 + s, where h is the height of the object
in feet, 1 is the elapsed time in seconds, and s is
the height of the balloon.
If the balloon is 400 feet from the ground, how
long will it take for an object dropped from the
balloon to hit the ground?
ximum
e used
garoo's
A
2.5 seconds
B.
5 seconds
C.
7.5 seconds
D.
10 seconds