Answer:
t = 3 seconds
Step-by-step explanation:
Given that,
Height of the building, h = 144 feet
Initial speed of the object, u = 0
To find,
After how many seconds does the object hit the ground.
Solution,
The equation of an object when it falls from height h is given by :
When the object hits the ground, h(t) = 0

t = 3 seconds
So, the object will take 3 seconds to hits the ground.