Question

the 5 second. )
A car travels along a 60 km road. It travels the first 30 km with a speed of 60 km/h. Whit
what speed should it travel the next 30km so as to average 40km/h? (3).​

Answer 1

Answer:

60km/h

Explanation:

v1 = 30 km/h

total distance of track = 60km

speed= distance / time

30=30/t

average velocity= total distance covered / total time taken

average velocity= 2v1*v2/ v1+v2

40 = 2 * 30v2/ 30+ v2

40(30+v2)= 60*v2

1200+400v2= 60v2

1200= 20v2

v2= 60 km/h