Question

Двигаясь по реке из пункта А в пункт В, лодка при постоянной мощности мотора перемещается относительно берега со скоростью 10м/с. Скорость течения 5 м/с. Найти скорость лодки относительно течения, если лодка движется по течению

Answer 1

Так как лодка двигается по течению, то скорости лодки и течения
сонаправлены, следовательно:
                           v = v₁ + v₀  =>   v₁ = v - v₀ = 10 - 5 = 5 (м/с)

Ответ: 5 м/с

Answer 2

Problem Analysis

We are given that a boat is moving from point A to point B along a river. The boat has a constant motor power and moves with a speed of 10 m/s relative to the shore. The river has a current with a speed of 5 m/s. We need to find the speed of the boat relative to the current when the boat is moving downstream.

Solution

To find the speed of the boat relative to the current, we need to consider the vector addition of the boat's velocity and the velocity of the current.

Let's assume: - Vb = speed of the boat relative to the shore (10 m/s) - Vc = speed of the current (5 m/s) - Vbc = speed of the boat relative to the current (unknown)

The velocity of the boat relative to the current can be calculated using the formula:

Vbc = Vb - Vc

Substituting the given values:

Vbc = 10 m/s - 5 m/s = 5 m/s

Therefore, the speed of the boat relative to the current when the boat is moving downstream is 5 m/s.

Answer

The speed of the boat relative to the current, when the boat is moving downstream, is 5 m/s.