Traffic collision

When investigating a traffic accident, it was found that the driver stopped the vehicle immediately after the accident by constant braking on a 150 m track in 15 seconds. Do you approve that the driver exceeded the permitted speed (50 km/h) in the village before braking?

Correct result:

v =  72 km/h

Solution:

s=150 m t=15 s s=at2/2 a=2 s/t2=2 150/152=431.3333 m/s2 v1=a t=1.3333 15=20 m/s v=3.6 v1=3.6 20=72=72 km/h v>50 km/h



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