An acceleration

The car goes on a straight road at a speed of 72 km/h. At some point, the driver starts to brake and stops the car in 5 seconds. Find: (a) the acceleration during braking and (b) the distance traveled during braking.

Correct answer:

a =  -4 m/s2
s =  50 m

Step-by-step explanation:

v1=72 km/h m/s=72:3.6  m/s=20 m/s v2=0 m/s  t=5 s  a=tv2v1=5020=4 m/s2
s=v1 t+21 a t2=20 5+21 (4) 52=50=50 m   Verifying Solution:  s0=v1 t=20 5=100 m s0>s

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