In an experiment to measure the height o...

In an experiment to measure the height of bridge by droping stone into water underneath. If the error in measurment of time is 0.2s at the end of 4s, then the error in estimation of height of bridge will be (neglect the water resistance i.e thrust)

`+-19.68m`

`+-17.22m`

`+-7.84m`

`+-12.22m`

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