Question

Тело 10 м двигалось со скоростью 72км/ч следующие 20 минут оно двигалось со скоростью 36 км/ч определить среднюю скорость движения тела

Answer 1

72+36÷2=54км/ч
Ответ : средняя скорость 54км/ч

Answer 2

Calculation of Average Speed

To determine the average speed of an object, we need to calculate the total distance traveled and the total time taken. In this case, the body traveled 10 meters with a speed of 72 km/h for a certain period of time, and then it traveled for another 20 minutes with a speed of 36 km/h.

Let's calculate the average speed step by step:

1. Convert the time taken for the second part of the motion from minutes to hours. Since 1 hour is equal to 60 minutes, 20 minutes is equal to 20/60 = 1/3 hours.

2. Calculate the total distance traveled by adding the distances covered in each part of the motion. The distance covered in the first part is 10 meters, and the distance covered in the second part is the product of the speed and time: 36 km/h * (1/3) hours.

3. Calculate the total time taken by adding the time taken for each part of the motion. The time taken for the first part is not given explicitly, so we will assume it is negligible compared to the time taken for the second part.

4. Finally, divide the total distance by the total time to find the average speed.

Let's perform the calculations:

1. The time taken for the second part of the motion is 1/3 hours.

2. The total distance traveled is 10 meters + (36 km/h * (1/3) hours).

3. The total time taken is the sum of the time taken for the first and second parts of the motion. Since the time taken for the first part is negligible, we can consider it as 0 hours.

4. The average speed is the total distance divided by the total time.

Now, let's calculate the average speed:

Total distance = 10 meters + (36 km/h * (1/3) hours) = 10 meters + 12 kilometers = 12,010 meters.

Total time = 0 hours + (1/3) hours = 1/3 hours.

Average speed = Total distance / Total time = 12,010 meters / (1/3) hours.

Therefore, the average speed of the body is 36,030 meters per hour.

Please note that the calculations assume a linear motion and neglect any acceleration or deceleration during the motion.