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People pulled the rope at a constant speed on the shore. How do boats move in the river? Add 50 ~ ~ ~ ~
Let me give you an idea, assuming that the speed of your rope does not change to one meter per second.

You can assume two extreme situations.

1。 Keep your rope in a straight line with the plane of the boat: man boat.

Then the moving speed of the ship is your rope speed of a meter per second.

2. Keep your rope and the plane of the boat infinitely close to the vertical angle:

mankind

|

|

boat

Then the horizontal moving speed of the ship is almost negligible.

Then you can consider, is it because the angle between the rope and the water is getting bigger and bigger, and the speed of the ship moving on the horizontal plane is getting smaller and smaller?

The answer is to slow down, no doubt |