Question

Мотоцикл двигался в течении 15 с со скоростью 5 м/с, в течение 10 с со скоростью 8 м/с и в течение 6 с со скоростью 20 м/с. Какова средняя скорость движения автомобиля?

Answer 1

вычислим общее время движения

15+10+6=31 сек

теперь общий путь

15*5+10*8+6*20=75+80+120=275м

 

ну а теперь среднюю скорость

275/31=8 целых 27/31 м/сек

Answer 2

Calculation of Average Speed

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

The motorcycle traveled at a speed of 5 m/s for 15 seconds, at a speed of 8 m/s for 10 seconds, and at a speed of 20 m/s for 6 seconds.

To find the total distance traveled, we can add up the distances traveled at each speed:

Distance traveled at 5 m/s = 5 m/s * 15 s = 75 m Distance traveled at 8 m/s = 8 m/s * 10 s = 80 m Distance traveled at 20 m/s = 20 m/s * 6 s = 120 m

Total distance traveled = 75 m + 80 m + 120 m = 275 m

To find the total time taken, we can add up the times taken at each speed:

Total time taken = 15 s + 10 s + 6 s = 31 s

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

Average speed = Total distance traveled / Total time taken

Average speed = 275 m / 31 s ≈ 8.87 m/s.

Therefore, the average speed of the motorcycle is approximately 8.87 m/s.