Question

A stone dropped from the top of the tower touches the ground in 4 sec. The height of the tower is about

• A. 80 m
• B. 40 m
• C. 20 m
• D. 160 m

Answer 1

Answer: (A)

80 m

Answer 2

$h = \frac{1}{2}gt^{2} = \frac{1}{2} \times 10 \times 4^{2} = 80m.$