Brakes

The braking efficiency of a passenger car is required to stop at 12.5 m at an initial speed of 40 km/h. What is the acceleration braking by brakes?

Correct result:

a =  -4.9383 m/s2

Solution:

v=40 km/h m/s=40/3.6  m/s=11.11111 m/s s=12.5 m v1=v+02=11.1111+02=509=5 595.5556 m/s  t=s/v1=12.5/5.5556=94=2 14=2.25 s  a=0vt=011.11112.25=40081=4 7681=4.9383 m/s2



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