Question: What is the time taken for an object to fall from a height of 45 m under gravity?

Options:

1. 3 s
2. 4.5 s
3. 5 s
4. 6 s

Correct Answer: 4.5 s

Solution:

Using the formula h = 0.5 * g * t², we can rearrange to find t = √(2h/g). Substituting h = 45 m and g = 9.81 m/s² gives t ≈ 4.5 s.