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
(b) the distance traveled during braking.

Correct result:

a =  -4 m/s2
s =  150 m

Solution:

v1=72 km/h m/s=72/3.6  m/s=20 m/s v2=0 m/s  t=5  a=v2v1t=0205=4 m/s2
s=v1 t12 a t2=20 512 (4) 52=150 m



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