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chanthonymjones
27.02.2020 •
Physics
A man can swim with a speed of 3 m/s in still water. He crosses a river of width 100 m by swimming in the direction that will take him across in the smallest possible time. When he reaches the opposite shore, he has been swept 50 m downstream. How fast is the river flowing?
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Ответ:
Explanation:
The given data is as follows.
width = 100 m, speed = 3 m/s
So, minimum time required to cross the stream is calculated as follows.
t =
Also, in the same time the man has moved downstream by 50 meter.
Hence, distance traveled downstream is as follows.
d = velocity of river × t
=![\frac{50}{\frac{100}{3}}](/tpl/images/0527/1869/16f9a.png)
=![\frac{3}{2}](/tpl/images/0527/1869/dbf42.png)
= 1.5 m/s
Thus, we can conclude that the river is flowing by 1.5 m/s.
Ответ:
c. i think im not entirely sure