A car travelling at 36 km/ hr seeds up to 72 km/hr in 5 sec what is its acceleration ? If the same car stops in 20 sec , what is its the retardation
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39
Case 1:
Initial velocity = 36km/h
=10 m/s
Final velocity = 72km/h
= 20m/s
Time taken = 5 s
Acceleration =( 20 -10)/5
= 10/5
= 2m/s^2
Case 2:
Initial velocity = 72km/h
= 20m/s
Final velocity = 0m/s
Acceleration = (0-20)/20
= -1m/s^2
So, retardation = 1m/s^2
Initial velocity = 36km/h
=10 m/s
Final velocity = 72km/h
= 20m/s
Time taken = 5 s
Acceleration =( 20 -10)/5
= 10/5
= 2m/s^2
Case 2:
Initial velocity = 72km/h
= 20m/s
Final velocity = 0m/s
Acceleration = (0-20)/20
= -1m/s^2
So, retardation = 1m/s^2
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