Question

Автомобиль первую половину пути проходит со средней скоростью v1 = 60 км/ч, а вторую — со средней скоростью v2 = 80 км/ч Определите среднюю скорость движения автомобиля на всем пути.

Answer 1

Ответ:

70 км/ч

Объяснение:

Vср = V1 + V2 / n          где n - кол-во скоростных отрезков

Vср = 60 км/ч + 80 км/ч / 2= 70 км/ч

Answer 2

Calculation of Average Speed

To determine the average speed of the car for the entire journey, we can use the formula:

Average Speed = Total Distance / Total Time

In this case, the car travels the first half of the distance at a speed of v1 = 60 km/h and the second half at a speed of v2 = 80 km/h.

Let's assume that the total distance traveled is d km. Since the car covers the first half of the distance at v1 and the second half at v2, the distance covered in each half is d/2 km.

The time taken to cover the first half of the distance can be calculated using the formula:

Time = Distance / Speed

For the first half of the distance, the time taken is (d/2) / v1.

Similarly, the time taken to cover the second half of the distance is (d/2) / v2.

The total time taken for the entire journey is the sum of the times taken for each half:

Total Time = (d/2) / v1 + (d/2) / v2

Now, we can substitute the values of v1 and v2 into the equation and simplify:

Total Time = (d/2) / 60 + (d/2) / 80

To find the average speed, we divide the total distance by the total time:

Average Speed = Total Distance / Total Time = d / [(d/2) / 60 + (d/2) / 80]

Let's calculate the average speed using this formula.