Question

Sample Problem 1. To estimate the height of a bridge over
a river, a stone is dropped freely in the river from the bridge.
The stone takes 2 seconds to touch the water surface in the
river. Calculate the height of the bridge from the water level
( = 9.8 m/s)​

Answer 1

Answer:

given that,

time taken by stone to reach the water=2s

let the height of the bridge be s

we know that for a freely falling body, u=0, a=9.8.

so,

S=ut+at²/2

s=9.8*2*2/2

s=19.6m

so the height of bridge above the water level is 20m.

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