A car starting from rest accelarate unitorunly and affair a speed of 80m/s in 30 5 it maintain this skady speed for another 30s, it thin stood down uniformly , until it comes to rest in the use 40s.
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Explanation:A: the 5.2 km traveled comprises 40 m/s av for 30 sec, 80 m/s for 30 sec and av of 40 m/s for 40 sec
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