Question

2. Первые 20 км пути машина ехала со скоростью 54 км/ч, вторые 300м машина ехала со скоростью 20 м/с. Определите среднюю скорость машины. Пожаааааалуйста срочно, можно с решением и запись "Дано" ПЖЖЖЖЖЖЖЖЖЖЖЖЖЖЖЖЖ ДАЮ 20 Б

Answer 1

Ответ:

перепиши ка к у меня и все

Answer 2

To find the average speed of the car, we need to calculate the total distance traveled and the total time taken.

Given: - The car traveled the first 20 km at a speed of 54 km/h. - The car traveled the next 300 m at a speed of 20 m/s.

Calculating the total distance:

- The car traveled 20 km in the first part of the journey. - The car traveled an additional 300 m, which is equal to 0.3 km.

Therefore, the total distance traveled by the car is 20 km + 0.3 km = 20.3 km.

Calculating the total time:

To calculate the total time, we need to convert the speed in the second part of the journey to km/h to match the units.

- The speed in the second part of the journey is 20 m/s. - To convert m/s to km/h, we multiply by 3.6 (1 m/s = 3.6 km/h).

Therefore, the speed in the second part of the journey is 20 m/s * 3.6 = 72 km/h.

Now we can calculate the total time taken: - The car traveled the first 20 km at a speed of 54 km/h. Using the formula time = distance / speed, the time taken for the first part of the journey is 20 km / 54 km/h. - The car traveled the next 0.3 km at a speed of 72 km/h. Using the same formula, the time taken for the second part of the journey is 0.3 km / 72 km/h.

Therefore, the total time taken is (20 km / 54 km/h) + (0.3 km / 72 km/h).

Now we can calculate the average speed: - Average speed = total distance / total time.

Let's calculate the average speed using the given values:

Given: - Distance 1: 20 km - Speed 1: 54 km/h - Distance 2: 0.3 km - Speed 2: 72 km/h

Calculations: - Total distance = Distance 1 + Distance 2 = 20 km + 0.3 km = 20.3 km - Total time = (Distance 1 / Speed 1) + (Distance 2 / Speed 2) = (20 km / 54 km/h) + (0.3 km / 72 km/h) - Average speed = Total distance / Total time

Now let's calculate the average speed:

Total time = (20 km / 54 km/h) + (0.3 km / 72 km/h) = 0.3704 hours

Average speed = Total distance / Total time = 20.3 km / 0.3704 hours ≈ 54.87 km/h

Therefore, the average speed of the car is approximately 54.87 km/h.

I hope this helps! Let me know if you have any further questions.