A tank is filled with water upto a height $1\,m$. A hole is made at a distance $20\, cm$ from top. Find, the horizontal distance from the base of the tank, where the water strikes the ground. ......... $cm$
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$R=2 \sqrt{\mathrm{h}(H-h)}$
$=2 \sqrt{20(100-20)}=2 \sqrt{20 \times 80}=80 \mathrm{cm}$
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