Two-thirds 80635

The car traveled the first third of the track with a constant speed of v1, the next two-thirds of the way at a constant speed of v2=72km/h, and the average speed of v=36km/h. Find v1.

Correct answer:

v1 =  18 km/h

Step-by-step explanation:

s1=1/3 s km s2=2/3 s km  v2=72 km/h v=36 km/h  t=s/v t2=s2/v2 t1=tt2  v1=s1/t1 v1=1/3 s/(s/vs2/v2) v1=1/3 s/(s/v2/3 s/v2) v1=1/3/(1/v2/3/v2)  v1=31/(1/v32/v2)=31/(1/3632/72)=18 km/h

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