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[" A staircase has steps each of "],[" h...

[" A staircase has steps each of "],[" height "20cm" and width "40cm" .A "],[" ball rolls off the top of the "],[" staircase horizontally with "],[" velocity "5m/s" .The ball hits the "],[" nth step from the top at the first "],[" bounce,then "n=..........." (take "],[g=10ms-2)]

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