a car is moving along a straight highway with speed of 126 km/h is brought to a stop within a distancen of 200 m.What is the retardation of the car (assumed uniform), and how long does it take for the car to stop?
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a car is moving along a straight highway with speed of 126 km/h is brought to a stop within a distancen of 200 m.What is the retardation of the car (assumed uniform), and how long does it take for the car to stop?
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Distance travelled before coming to rest (s)=200m
Final velocity of the car (v) =0 (as it comes to rest)
Using the 3rd equation of motion,
v^2 - u^2 = 2as
a = (v^2 - u^2)/2s
=(0 - 35^2)/2×200
= –1225/400
= –3.06m/s^2
Let time taken to come to rest is t sec
Using the 1st equation of motion,
v = u + at
0 = 35 – 3.06×t
t =35/3.06
=11.43 sec
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