Question

Show that a boat must move at an angle 90° with respect to river water in order to cross
river in minimum time?
frie water. The angle between​

Answer 1

Answer:

180

Explanation:

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Answer 2

Answer:

If the boat has to move along the line AB. The resultant velocity of should be directed along boat reaches the point B directly for this to happen , the boat velocity with respect to water should be directed such that it makes an angle with the line AB upstream as shown in figure.

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