##
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?

## 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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