A fisherman must travel directly across a river of width D to get back to his camp. (He’s trying to take the shortest path across the river.) In still water, he can row with speed vf (‘f’ for fisherman), but the river is moving with speed vr (‘r’ for river). How long will it take him to cross the river? You may assume he travels straight across the river to the other side.

University Physics Volume 1
18th Edition
ISBN:9781938168277
Author:William Moebs, Samuel J. Ling, Jeff Sanny
Publisher:William Moebs, Samuel J. Ling, Jeff Sanny
Chapter4: Motion In Two And Three Dimensions
Section: Chapter Questions
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A fisherman must travel directly across a river of width D to get back to his camp. (He’s trying to take the shortest path across the river.) In still water, he can row with speed vf (‘f’ for fisherman), but the river is moving with speed vr (‘r’ for river). How long will it take him to cross the river? You may assume he travels straight across the river to the other side.

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