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)
A
20m
B
40m
C
80m
D
160m
Verified Correct Answer: C.
Physical Principles & Numerical Solution
H = \(\frac{1}{2} gt^2\)
\(\frac{1}{2} \times 10 \times 4^2 = 80\)
Source: Myschool Past Questions Archive (Record #35534)