Acceleration 4211

At the start of braking, the car had a speed of 72 km h at -1. It stopped on a track of 50 m. What was the acceleration, and how long did the braking last?

Correct answer:

a =  -4 m/s2
t =  5 s

Step-by-step explanation:

v1=72 km/h m/s=72:3.6  m/s=20 m/s v2=0 m/s  s=50 m v=2v1+v2=220+0=10 m/s  t=s/v=50/10=5 s  a=tv2v1=5020=4 m/s2



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