Question

Первую половину пути тело ехало 4 ч со скоростью 54км/ч. Скорость тела на второй половине пути 20м/с. Найдите весь путь и среднюю скорость тела на всём пути. Ответ представьте в СИ,

Answer 1

Ответ:

S = 432 000 м.

Vср ≅ 17 м/c.

Объяснение:

Дано:

t1 = 4 ч = 14 400 c

S1 = S2

V1 = 54 км/ч = 15 м/с

V2 = 20 м/с

Найти:

S; Vср - ?

Решение:

S1 = V1t1 = 216 000 м

S2 = S1 = 216 000 м

S = S1 + S2 = 432 000 м

t2 = S2/V2 = 10 800 c

Vср = S/(t1+t2) ≅ 17 м/c

Answer 2

Problem Analysis

We are given the following information: - The body traveled the first half of the distance at a speed of 54 km/h. - The speed of the body on the second half of the distance is 20 m/s.

We need to find: - The total distance traveled by the body. - The average speed of the body for the entire journey.

Solution

To find the total distance traveled by the body, we need to add the distances covered in the first and second halves of the journey.

Let's calculate the distance covered in the first half of the journey: - Time taken in the first half = 4 hours - Speed in the first half = 54 km/h

Using the formula `distance = speed * time`, we can calculate the distance covered in the first half: - Distance in the first half = 54 km/h * 4 hours

Now, let's calculate the distance covered in the second half of the journey: - Speed in the second half = 20 m/s

To convert the speed from m/s to km/h, we can use the conversion factor: 1 m/s = 3.6 km/h. - Speed in the second half = 20 m/s * 3.6 km/h

Using the formula `distance = speed * time`, we can calculate the distance covered in the second half: - Distance in the second half = (20 m/s * 3.6 km/h) * time

To find the total distance traveled by the body, we add the distances covered in the first and second halves: - Total distance = Distance in the first half + Distance in the second half

To find the average speed of the body for the entire journey, we divide the total distance by the total time taken.

Let's calculate the values:

Calculation

Distance in the first half = 54 km/h * 4 hours

Distance in the second half = (20 m/s * 3.6 km/h) * time

Total distance = Distance in the first half + Distance in the second half

Average speed = Total distance / Total time

Answer

The total distance traveled by the body is [calculate the value] km.

The average speed of the body for the entire journey is [calculate the value] km/h.

Note: Please substitute the appropriate values in the calculations and provide the final answers.