A car starting from rest is accelerated at constant rate until it attains a speed of 12m/s. it moves with the constant speed 12m/s for some time then it is retarded at other constant rate until it comes to rest. considering that the car moves with constant speed for half of the time of total journey, what will be the average speed of car of the whole journey (in m/s)?
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the answer of this question is the average speed is 6 metre per second
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