"\\begin{cases}\nL = vt; \\\\\nH = \\frac{1}{2}gt^2;\n\\end{cases} \\\\\nt = \\sqrt{\\frac{2H}{g}}; \\\\\nv = \\frac{L}{t} = L\\sqrt{\\frac{g}{2H}} = 1.5\\text{ m}\\sqrt{\\frac{9.81\\frac{\\text{m}}{\\text{s}^2}}{2\\cdot1.7\\text{ m}}} \\approx 2.55 \\frac{\\text{m}}{\\text{s}}."
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