Question

Автомобиль проехал 120 км со скоростью 60 км .ч а потом еше 1 час он ехал со скоростью 90 км .ч определить среднию скорость в км.ч и потом в метрах в секунду .

Answer 1

120+90/2+1=70 км/ч как-
то так 

Answer 2

Calculation of Average Speed

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

The car first traveled 120 km with a speed of 60 km/h. This means it took 2 hours to cover this distance.

Then, the car traveled for an additional 1 hour with a speed of 90 km/h.

To find the total distance traveled, we add the distance covered in the first part to the distance covered in the second part:

Total distance = 120 km + (90 km/h * 1 h) = 120 km + 90 km = 210 km.

To find the total time taken, we add the time taken in the first part to the time taken in the second part:

Total time = 2 hours + 1 hour = 3 hours.

Now, we can calculate the average speed:

Average speed = Total distance / Total time = 210 km / 3 hours = 70 km/h.

Conversion to Meters per Second

To convert the average speed from kilometers per hour to meters per second, we need to multiply it by a conversion factor.

1 kilometer is equal to 1000 meters, and 1 hour is equal to 3600 seconds.

So, the conversion factor is:

Conversion factor = (1000 meters / 1 kilometer) / (1 hour / 3600 seconds) = 1000 / 3600 = 0.2778 meters per second per kilometer per hour.

To convert the average speed from kilometers per hour to meters per second, we multiply it by the conversion factor:

Average speed in meters per second = 70 km/h * 0.2778 m/s/km/h = 19.4444 m/s.

Therefore, the average speed of the car is 70 km/h and 19.4444 m/s in meters per second.