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2015-04-18T20:19:01+05:30

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Initial speed, u=18km/h=5m/s
t=5s
final speed, v=0km/h

velocity of car t seconds after applying the breaks is given by
v(t)=u+at

plugin the given values above and find a :
0=5+a(5)\implies a=-1m/s^2

therefore the velocity of car as a function of time is
v(t)=5-t

plugin t=2 for the velocity of car 2 seconds after applying breaks:
v(t)=5-2=3m/s=10.8km/h
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