# I need more ropes

Classical Mechanics Level 3

I want to take the water from the well with a bucket attach to rope. The problem is, I don’t know the deep of the well, so I decided to drop a marble from the top of the well and $$\frac{35}{17}$$ second later the sound of the marble I dropped touched the water on the well heard. If $$g = 10 \text{ m/s}^2$$ and the speed of sound is $$340 \text{ m/s}$$, calculate the minimum length of the rope that I need to get the water from the well.

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