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

The correct option is A

80 m

We have,

$h=\frac{1}{2}g{t}^2=\frac{1}{2}\times 10\times (4{)}^2=80m$