"v = \\sqrt{2\\times g \\times h}"
velocity after collision, "v = \\frac{3}{4} \\times \\sqrt {2 \\times 10 \\times 20} = 15m\/s"
"t = \\frac{2u}{g} = \\frac{2\\times 15}{10}=3seconds" (time interval)
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