Question

derive an expression for the crossing time and drift for the case in which man crosses a river of width w in minimum time.​

Answer 1

Answer:

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Answer 2

Explanation:

$\huge\underline{ \mathbb\red{❥A} \green{n} \mathbb\blue{S} \purple{w} \mathbb \orange{E} \pink{r}}\:$

v

b

=4,v

r

=2,d=500m

For shortest possible time v

b

should be along AB

t=

v

b

d

t=

4

500

=125sec

drift : horizontal displacement of the boat

drift = v

r

×t

=2×125

=250m

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