Question

Marian se deplaseaza ,cu automobilul,pe autostrada.La ora 10 si 35 minute el se afla la kilometrul 25 .Dupa un interval de timp,la ora 11 si 15 minute,el se afla la kilometrul 100.Calculati :durata deplasarii,distanta parcursa de Marian si viteza medie a acestuia(exprimata in unitati de SI)

Answer 1

Step-by-step explanation:

If Marian travels, by car, on the highway. At 10 and 35 minutes he is at kilometer 25. After a period of time, at 11 and 15 minutes, he is at kilometer 100.  

Total distance covered = 25km + 100km

Total distance covered by Marian = 125km

Total time taken by marian = 10hr 35min + 11hr + 15min

Total time taken by marian = (10+11)hr + (35+15)min

Total time taken by marian = 21hr 50mins

Total time taken by marian  = 21 * 50/60 hr

Total time taken by marian (Duration) = 21.833hr

Average speed = Total distance covered/Total time taken

Average speed = 125/21.833

Average speed = 5.725km/hr

Convert to m/s

5.725km/hr = 5.725*1000/3600

5.725km/hr = 5725/3600

5.725km/hr = 1.5903 m/s

Hence the average speed expressed in SI unit is 1.5903 m/s