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.

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asked Feb 22, 2018 in Physics by shabnam praween (19,050 points) 5 6 8

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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answered Feb 22, 2018 by mdsamim (213,225 points) 5 10 15
selected Feb 22, 2018 by shabnam praween
 
Best answer

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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