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  4. A man is crossing a river flowing with velocity of 5 m/s. He reaches a point directly across at a distance of 60 m in 5 s. His velocity in still water should be

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Q. A man is crossing a river flowing with velocity of $5\, m/s$. He reaches a point directly across at a distance of $60 \,m$ in $5\, s$. His velocity in still water should bePhysics Question Image

Motion in a Plane

Solution:

$t=\frac{d}{\sqrt{v^{2}-u^{2}}}$
$\Rightarrow 5 =\frac{60}{\sqrt{v^{2}-u^{2}}}$
$\Rightarrow u=13\, m/s$