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A car moving along a straight highway with a speed of 126 km h–1 is brought to a stop within a distance 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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Initial velocity of the car, u = 126 km/h = 35 m/s 

Final velocity of the car, v = 0 

Distance covered by the car before coming to rest, s = 200 m 

Retardation produced in the car = a 

From third equation of motion, a can be calculated as:

From first equation of motion, time (t) taken by the car to stop can be obtained as:

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