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  4. Water drops fall at regular intervals from a tab which is hm above the ground. After how many seconds does the first drop reach the ground?

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Q. Water drops fall at regular intervals from a tab which is hm above the ground. After how many seconds does the first drop reach the ground?

Motion in a Straight Line

Solution:

$h = ut +\frac{1}{2} gt ^2$
$ \Rightarrow h =\frac{1}{2} gt ^2[\because u =0] $
$\therefore t =\sqrt{2 h / g }$