# Physics

A man drops a stone into a water well on his farm. He hears the sound of the splash 3.25 s later. The acceleration of gravity is 9.8 m/s2 and the speed of sound in air is 326 m/s. How deep is the well?

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1. 100.3 meters, if I'm not mistaken..

Well deep = 326/3.25= ~100m

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2. Denote the height by h, and the time for stone to descend t, we have the equation
h=ut+(1/2)gt&sp2;
where
u=0 m/s, initiial speed, and
g=acceleration due to gravity.

For the sound to return, we have
h=326 m/s*(3.25-t)

Solve for h and t using the two equations.
You should have t=3.1 and h=47 m approximately

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3. h=ut+(1/2)gt²

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4. Thanks a lot

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5. How exactly was h and t solved for?

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6. Explain further pls

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