Question

По горизонтальному участку пути автомобиль ехал со скоростью 37,8 км/час в течение 12 минут, а затем преодолел подъем со скоростью 108 км/час за 8 минут. Чему равна средняя скорость на всем пути? ​

Answer 1

37,8 км/ч = 10,5 м/с

12 минут = 720 секунд

108 км/ч = 30 м/с

8 минут = 480 секунд, следовательно

vср = (v1*t1+v2*t2)/t1 + t2

vср = (10,5*720+30*480)/1200 = 18,3 м/с

Answer 2

Calculation of Average Speed

To calculate the average speed for the entire journey, we need to find the total distance traveled and the total time taken.

Given information: - The car traveled at a speed of 37.8 km/h for 12 minutes. - The car then traveled uphill at a speed of 108 km/h for 8 minutes.

To find the total distance traveled, we need to calculate the distance covered during each segment of the journey.

Distance covered during the first segment: Speed = 37.8 km/h Time = 12 minutes = 12/60 hours = 0.2 hours

Distance = Speed x Time Distance = 37.8 km/h x 0.2 hours = 7.56 km

Distance covered during the second segment: Speed = 108 km/h Time = 8 minutes = 8/60 hours = 0.1333 hours

Distance = Speed x Time Distance = 108 km/h x 0.1333 hours = 14.4 km

Now, we can find the total distance traveled by adding the distances covered during each segment: Total Distance = Distance of First Segment + Distance of Second Segment Total Distance = 7.56 km + 14.4 km = 21.96 km

To find the total time taken, we need to add the times taken during each segment: Total Time = Time of First Segment + Time of Second Segment Total Time = 12 minutes + 8 minutes = 20 minutes = 20/60 hours = 0.3333 hours

Finally, we can calculate the average speed using the formula: Average Speed = Total Distance / Total Time

Average Speed = 21.96 km / 0.3333 hours = 65.89 km/h

Therefore, the average speed for the entire journey is approximately **