An object travels 10 km at a speed of 100 m/s and another 10 km at 50 m/s. The average speed over the whole distance is______
A. 75 m/s
B. 55 m/s
C. 66.7 m/s
D. 33.3 m/s
Answer:C
An object travels 10 km at a speed of 100 m/s and another 10 km at 50 m/s. The average speed over the whole distance is______
A. 75 m/s B. 55 m/s C. 66.7 m/s D. 33.3 m/s