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Subject :NSO    Class : Class 9

On a straight road, a car starts from rest and accelerates at uniform rate of 6 m s-2 for some time, then moves with constant speed for some time and retards at the same uniform rate and comes to rest. Total time for the journey is 24 s and average speed for journey is 20 m s-1. How long does the car move with constant speed?

A4 s
B 8 s
C 12 s
D 16 s

answer given is wrong

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