A car is moving in a straight line with speed 18km/h.It is stopped in 5s by applying the brakes .Find:(1)the speed of car in m/s,(2)the retardation and(3)the speed of car after 2s of applying the brakes.
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Answer:Given, Speed=18km/h,t=5s
a)The speed of the car in m/s=18×
18
5
=5 m/s
b) The retardation is:
a=
t
v−u
=
5
0−5
=1m/s
2
c) The velocity of the as a funcition of time 2sis:
v(t)=5−t⇒v(t)=5−2=3m/s=10.8 km/h
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