The Height, in Feet, of a Free-Falling Object T Seconds $h(t)=-16 t^{2}+s$

Multiple Choice

The height, in feet, of a free-falling object t seconds after being dropped from an initial height s can be found using the function $h(t) =-16 t^{2}+s$ . An object is dropped from a helicopter 576 feet above the ground. How long will it take the object to land on the ground?

A) 7.5 seconds
B) 8 seconds
C) 5 seconds
D) 6 seconds