Final answer:
It will take approximately 5.59 seconds for the rock to reach the ground.
Step-by-step explanation:
The equation t=√h/4 represents the time t in seconds that it takes an object to fall from a height of h feet.
To estimate how long it will take a rock to fall from a height of 125 feet, we can substitute the value of h into the equation.
t = √125/4 = √31.25 = 5.59 seconds (rounded to two decimal places)
Therefore, it will take approximately 5.59 seconds for the rock to reach the ground.