a car moving along a straight road with speed of 144 km per hour is brought to brought to stop within a distance 1 unit what is the retardation of car and how long does it takes to come to rest
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Answer:
-40 m/s²
Explanation:
Intial velocity of car = 144 km/h= 40 m/s
Time taken by car to stop= 1 unit
Final velocity of car = 0m/s (because car had stopped)
Firstly, converting 144 km/h into m/s,
144 km/h = 144 x 1000m/ 3600s= 40m/s.
Now retardation is negative acceleration. So,
Retardation of car = Final velocity-Initial velocity/time
= 0-40/1 = -40 m/s². Ans.
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