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A person measures the depth of a well by...

A person measures the depth of a well by measuring the time interval between dropping a stone and receiving the sound of impact with the bottom of the well. The error in his measurement of time is `eltaT=0.01` seconds and he measures the depth of the well to be `L=20` meters. Take the acceleration due to gravity `g=10 ms^(-2)` and the velocity of sound is `300 ms^(-1).` Then the fractional error in the measurement, `deltaL//L,`is closest to

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A stone is dropped into a well and the sound of inpact of stone on the water is heard after 2.056 sec of the release of stone form the top. If acc. Due to gravity is 980 cm//sec^(2) and velocity of sound in air is 350 m//s , calculate the depth of the well.