A boat is sailing up the river. Compare the speed of the boat relative to the shore and relative to the branch floating in the water.
| December 13, 2020 | education
If the boat is sailing up the river, it means that it is sailing against the current.
Let v-boat speed, u-current speed.
Therefore, the speed relative to the coast is modulus (v-u).
The branch does not have its own speed, i.e. floats with the flow at the speed of a river
Then the speed of the boat relative to the branch = v-u + u = v
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