An object is dropped from the top of a tower. If it takes 4s for it to reach the ground, calculate the height of the tower.(g = 10 ms-2, ignore air resistance)
- 20m
- 40m
-
80m
- 160m
The correct answer is: C
Explanation
H = \(\frac{1}{2} gt^2\)
\(\frac{1}{2} \times 10 \times 4^2 = 80\)