Final answer:
Using the formula for distance under gravity, d = (1/2)gt², and plugging in 2.5 seconds for t, the height from which the object fell is calculated to be approximately 30.625 meters. Therefore, the closest answer choice is (c) 30 m.
Step-by-step explanation:
To determine from what height an object fell if it takes 2.5 seconds to hit the ground, we can use the formula for the distance (d) traveled under constant acceleration due to gravity. The formula is d = (1/2)gt², where g is the acceleration due to gravity (approximately 9.8 m/s² on Earth), and t is the time in seconds. We plug in the values to get:
d = (1/2) * 9.8 m/s² * (2.5 s)²
d = (1/2) * 9.8 * 6.25
d = 30.625 m
However, since none of the answer options match this number exactly, and the closest option is 30 m, we consider that due to rounding or potential minor measurement inaccuracies, the best answer for the provided options is (c) 30 m.