Question

To estimate the height of a bridge over a river, a stone is dropped freely into the river from the top of a bridge. The stone takes 2 seconds to touch the water surface in the river. Calculate the height of the bridge from the water level

Answer 1

let the speed of stone be x 
so if distance = speed x time 
then distance from water to bridge =>
= 2x units

Answer 2

0.20 meter is the height of the bridge