A car moving along a straight highway with 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?
1. \(1.5~\text{m/s}^2,~20~\text s\)
2. \(2.5~\text{m/s}^2,~15~\text s\)
3. \(3.06~\text{m/s}^2,~11.4~\text s\)
4. \(4.2~\text{m/s}^2,~8.5~\text s\)
: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
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