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Answer:
-1 m/s²
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Given:-
☛Final velocity= 0m/s
☛Initial velocity= 72km/h
☛Distance covered = 200m
Find:-
☛Retardation-?
Formula to be used:-
where,
v= final velocity
u=initial velocity
a=acceleration(-retardation)
s= distance covered
Solution:-
First Change km/h to m/s
we know,
1km=1000m
1hr= 3600sec
Initial velocity = 20m/s
Using 3rd equation of motion,
Therefore, Retardation produces is -1m/s².
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