Question

Решите пожалуйста...поезд двигался на подъеме со средней скоростью 60 км/ч, а на спуске его средняя скорость составила 20м/с . Определите среднюю скорость на всем участке пути, если учесть, что спуск в два раза длинее подъема. Пожалуйста объясните...

Answer 1

ну  притставим  себе  при подёме  поезд двигалсья   60 км /ч  наспуске средняя  скорость составило 20 метров в сикунду за десять секунд  поезд двигалсья  200 метров за  минуту  1200 метров  а в час  пи спуске поезд двигался  72 км/ч  20*60=1200   1200*60=72000

Answer 2

Calculating Average Speed on Incline and Decline

To calculate the average speed on the entire stretch of the journey, we need to consider the speeds on the incline and the decline, taking into account that the decline is twice as long as the incline.

1. Speed on the Incline: - The train's average speed on the incline was 60 km/h.

2. Speed on the Decline: - The train's average speed on the decline was 20 m/s.

3. Length of Incline and Decline: - Given that the decline is twice as long as the incline.

Calculating Average Speed

To calculate the average speed for the entire journey, we can use the formula:

Average Speed = Total Distance / Total Time

Determining Total Distance

To determine the total distance, we need to consider the distances traveled on the incline and the decline.

1. Distance on the Incline (d1): - Let's assume the distance on the incline is represented by d1.

2. Distance on the Decline (d2): - Since the decline is twice as long as the incline, the distance on the decline is 2d1.

3. Total Distance (d_total): - The total distance is the sum of the distances on the incline and the decline: d_total = d1 + 2d1 = 3d1.

Determining Total Time

To determine the total time, we need to consider the time taken on the incline and the decline.

1. Time on the Incline (t1): - The time taken on the incline can be calculated using the formula t = d / v, where d is the distance and v is the speed.

2. Time on the Decline (t2): - Similarly, the time taken on the decline can be calculated using the same formula.

3. Total Time (t_total): - The total time is the sum of the times on the incline and the decline: t_total = t1 + t2.

Calculating Average Speed

Now, we can calculate the average speed using the formula:

Average Speed = Total Distance / Total Time

By substituting the values of total distance and total time, we can find the average speed for the entire journey.

Let's proceed with the calculations.