A 0.14-km wide river flows with a uniform speed of 4.0 m/s toward the east. It takes 20 s for a boat to cross the river to a point directly north of its departure point on the south bank. What is the speed of the boat relative to the water?
I'm mostly concerned about the wording and which part of the "triangle" that the answer is referring to!
2. Homework Equations
V = D/T
The Attempt at a Solution
V = 0.14/20 = 7m
Can someone help me explain how the speed of the boat relative to the water would be referring to the velocity in the y direction for the boat? How do i know that it isn't referring to the hypotenuse ? Overall, i usually get confused with the wording for "relative to _____" because I don't know which part of the triangle it would be a part of!
If i didn't know that the speed of the boat relative to the water is in the y direction, then i wouldn't know that i could just use the formula V = D/T!
For instance, I would think the boat's speed relative to the water is different from the boat's speed relative to the earth/ground
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