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q:an automobile moving with a velocity of 54 km/hr is brought to rest by a distance of 9 m by the application of brakes.find the retardation assuming it to be uniform.
use the formula 2as= v2-u2
where a= acceleration or retardation s=distance v=final speed u = initial speed
final speed =0 as automobile comes to rest
as distance is in metres , so also take speed in m/s.
u= 54km/h=54*1000/3600=15m/s
applying formula,
2*a*9=0-152
so a= 225/18=12.5 m/s2
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