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Answer :
Final answer:
The depth of the well is 78.4 m.
Explanation:
In order to calculate the depth of the well, we can use the equation for free fall. The distance fallen by an object in free fall can be given by the formula: d = (1/2)gt^2, where d is the distance fallen, g is the acceleration due to gravity (approximately 9.8 m/s^2), and t is the time taken.
In this case, the stone takes 4 seconds to hit the water, so we can substitute t = 4 into the formula.
d = (1/2)(9.8 m/s^2)(4 s)^2 = 78.4 m
Therefore, the depth of the well is 78.4 m.
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