Question

Числовое значение скорости лодки вверх по течению реки относительно растущих деревьев - 2,7 м/с, а если плыть вниз по реке - 4,7 м/с. Напишите, с какой скоростью по модулю движется река относительно растущих деревьев.

Answer 1

Ответ:

1 м/с

Объяснение:

Скорость лодки Vл

Скорость реки  Vр

Vл+Vр=4,7

Vл-Vр=2,7

Сложим уравнения

Vл+Vр+Vл-Vр=4,7+2,7

2Vл=7,4

Vл=7,4/2=3,7 (собственная скорость лодки)

Подставим в любое из первых двух уравнений, пусть во второе:

Vл-Vр=2,7

3,7-Vр=2,7

Vр=1 м/с (собственная скорость реки)

Answer 2

Calculation of River Velocity Relative to Trees

To calculate the velocity of the river relative to the trees, we can use the concept of relative velocity. The relative velocity of an object moving with respect to another object is the difference between their individual velocities.

Given the following information: - Velocity of the boat upstream (against the current) relative to the trees: 2.7 m/s - Velocity of the boat downstream (with the current) relative to the trees: 4.7 m/s

We need to find the velocity of the river relative to the trees.

To find the velocity of the river, we can subtract the velocity of the boat from the velocity of the boat relative to the trees.

Let's assume the velocity of the river relative to the trees is V.

The velocity of the boat upstream relative to the river is 2.7 m/s. Therefore, the velocity of the river relative to the trees is:

V = 2.7 m/s

The velocity of the boat downstream relative to the river is 4.7 m/s. Therefore, the velocity of the river relative to the trees is:

V = -4.7 m/s

Therefore, the velocity of the river relative to the trees is -4.7 m/s.

Please note that the negative sign indicates that the river is flowing in the opposite direction of the boat's downstream motion.