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A ball rolls off the top of a stairway w...

A ball rolls off the top of a stairway with horizontal velocity "u" .The steps are "0.1m high and "0.1m" wide.The minimum velocity "u" with which that ball just hits the step "5" of the stairway will be `sqrt(x)ms^(-1)` where `x=...` [use `g=10m/s^(2)`].

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