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Standard VI

Physics

Speed

A man is cros...

Question

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 $5 s e c$ ⁡. His velocity in still water should be

10 m / s

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13 m / s

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5 m / s

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12 m / s

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Solution

The correct option is B $13 m / s$

Given, $v_{r} = 5 m / s$

$t = \frac{l}{\sqrt{v^{2} - u^{2}}}$

$5 = \frac{60}{\sqrt{v^{2} - 5^{2}}}$

$v^{2} - 5^{2} = 12^{2}$

$v = 13 m / s$

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Speed

Standard VI Physics

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

The correct option is B 13 m/s Given, vr=5 m/s t=l√v2−u2 5=60√v2−52 v2−52=122 v=13 m/s

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 $5 s e c$ ⁡. His velocity in still water should be

The correct option is B $13 m / s$

Given, $v_{r} = 5 m / s$

$t = \frac{l}{\sqrt{v^{2} - u^{2}}}$

$5 = \frac{60}{\sqrt{v^{2} - 5^{2}}}$

$v^{2} - 5^{2} = 12^{2}$

$v = 13 m / s$