Question

Мотоциклист за первые 2 часа проехал 90 км а следующие три часа двигался со скоростью 14 м/с какова средня скорость мотоциклиста

Answer 1

Чтобы найти среднюю скорость, надо весь путь разделить на все время.
Итак: 3 часа = 180 мин = 10800 с, значит за эти 3 часа он пройдет путь 14*10800 = 151 200 м, а в первый раз за 2 часа он прошел путь 90 000 м, 2 часа = 7200 с.

$v = \frac{151200+ 90000}{7200+10800} = 13,4$ м/с средняя скорость

Answer 2

Calculation of Average Speed

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

The motorcyclist traveled 90 km in the first 2 hours. This gives us a speed of 45 km/h for the first 2 hours.

In the next 3 hours, the motorcyclist traveled at a speed of 14 m/s. To convert this to km/h, we can use the conversion factor: 1 m/s = 3.6 km/h. Therefore, the speed in km/h is 50.4 km/h.

To find the total distance traveled, we add the distance traveled in the first 2 hours to the distance traveled in the next 3 hours: 90 km + (14 m/s * 3 hours * 3.6 km/h) = 90 km + 151.2 km = 241.2 km.

To find the total time taken, we add the time taken in the first 2 hours to the time taken in the next 3 hours: 2 hours + 3 hours = 5 hours.

Now, we can calculate the average speed by dividing the total distance traveled by the total time taken: Average speed = Total distance / Total time = 241.2 km / 5 hours = 48.24 km/h.

Therefore, the average speed of the motorcyclist is approximately 48.24 km/h.