Answer:
Time, t = 8 seconds
Explanation:
An object is thrown upward from the top of a 128-foot building with an initial velocity of 112 feet per second. The height h as a function of time t is given by :
[tex]h=-16t^2+112t+128[/tex]
We need to find the time when the object will hit the ground. When it will hit the ground, h = 0
So,
[tex]-16t^2+112t+128=0[/tex]
On solving the above quadratic equation, we get the value of t = 8 seconds. So, after 8 seconds the object will hit the ground. Hence, this is the required solution.