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A stone is dropped from the top of the well that has water in it at a depth of 30.0 m. How long does it take the stone to reach the water?

NataleeLeblanc  Feb 13, 2017
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I'm assuming that the water surface is 30m below the top of the well......so

 

-30  = -4.9t^2     divide both sides by -4.9

 

[ -30 / -4.9 ]  = t^2     take the positive root of both sdes

 

sqrt [ -30 / -4.9]  = t   ≈ 2.47 sec

 

 

cool cool cool

CPhill  Feb 13, 2017

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