Question

S1=10м T1=20c S2=30м V2=18км/ч найти среднюю скорость

Answer 1

vср= (s1+s2)/(t1+t2)

найдем t2 по формуле

t=s/v

переводим км/ч в м/с v2=5

получаем t2=30/5=6

sобщ=s1+s2=10+30=40

tобщ=t1+t2=20+5=25

vср=40/25=1,6

Answer 2

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

Average Speed = Total Distance / Total Time

We have the following values:

S1 = 10 meters (distance 1) T1 = 20 seconds (time 1) S2 = 30 meters (distance 2) V2 = 18 km/h (speed 2)

Before proceeding, let's convert the speed V2 from kilometers per hour to meters per second, as the units of T1 and S1 are in seconds and meters, respectively.

1 kilometer = 1000 meters 1 hour = 3600 seconds

So, to convert V2 from km/h to m/s:

V2_mps = (18 km/h) * (1000 m/km) / (3600 s/h) = 5 m/s

Now, we can find the total distance and total time:

Total Distance = S1 + S2 = 10 m + 30 m = 40 meters

Total Time = T1 + Time taken to cover S2 with V2 = 20 s + (S2 / V2_mps)

Total Time = 20 s + (30 m / 5 m/s) = 20 s + 6 s = 26 seconds

Now, we can calculate the average speed:

Average Speed = Total Distance / Total Time Average Speed = 40 meters / 26 seconds ≈ 1.54 m/s

Therefore, the average speed is approximately 1.54 meters per second.