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a stone is dropped down a well if it takes 5s to reach the surface of the water calculate how deep the well is , what is the velocity when it reaches the surface of the water

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d = 0.5g*t^2.
g = 9.8 m/s^2, t = 5s.

V = Vo + g*t.
Vo = 0, g = 9.8, t = 5s.

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