Question

Question 3.6:
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 1

Answer:

3.6

Explanation:

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:3.6

Answer 2

Explanation:

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