3.6 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 ?
: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
We know that,
v2−u2=2as
(0) −(35)2=2×a×200
a=−35×352×200=−3.06 m/s2
Using,
v=u+at
t=v−ua=0−35(−3.06)=11.44s
© 2025 GoodEd Technologies Pvt. Ltd.