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The Equations of Motion

To estimate t...

Question

To estimate the height of a bridge over the river, a stone is dropped freely on the river from the bridge. the stone takes 2m/s to touch the water surface in the river. calculate the height of the bridge from water level. (g= 9.8 m/s²)

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Solution

initial velocity u=0
a=9.8m/s²
final velocity v=2m/s
2as=v²-u²
s=2²-0 /2Ã—9.8
=4/19.6
s=0.20m

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