Question

S1 - 1200 м, V1 - 10 м/с, следущий S2 - 1200 м, V2 - 15 м/с .Найти среднюю скорость.

Answer 1

Т.к S1 = S2 , тогда среднюю скорость находим по формуле
$< v > = \frac{2 \times v1 \times v2}{v1 + v2}$
$< v > = \frac{2 \times 10 \times 15}{10 + 15} = \frac{300}{30} = 10 \frac{m}{c}$
Ответ : 10 м\с

Answer 2

To find the average speed, we can use the formula:

Average speed = Total distance / Total time

Let's first calculate the total distance traveled and the total time taken.

For the first segment (S1), we have: Distance (S1) = 1200 meters Speed (V1) = 10 m/s

Time taken for S1 = Distance / Speed = 1200 m / 10 m/s = 120 seconds

For the second segment (S2), we have: Distance (S2) = 1200 meters Speed (V2) = 15 m/s

Time taken for S2 = Distance / Speed = 1200 m / 15 m/s = 80 seconds

Now, to find the total distance and the total time, we add the respective values for S1 and S2:

Total distance = S1 + S2 = 1200 m + 1200 m = 2400 meters Total time = Time taken for S1 + Time taken for S2 = 120 seconds + 80 seconds = 200 seconds

Finally, we can calculate the average speed:

Average speed = Total distance / Total time = 2400 m / 200 s = 12 m/s

Therefore, the average speed for the entire journey is 12 meters per second.