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a car begin to move from rest for the first half of path it moves with constant acceleration. then it moves with the attained velocity of 18m/s for the rest path.What is its average speed for the entire path ?
Is the answer ~15.36m/s or 10.26m/s?If yes then here’s how I did-=>v2=v02+as (2xs/2=s)=>v2=as …................................(A)Now v becomes v0 for the second case,=>182=v2+as =>324=2as=>as=162=>v2=162v=12.72Now average speed, v (conjugate)= u+v/2=30.72/2=15.36I don’t remember very well, but the average speed could also be=u+v+vf/3=30.72/3=10.26m/s
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