01-12-2017
Mathematics

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Аноним Аноним

01-12-2017

At time 5 seconds distance is 0.8(5)^2 = 20 m
after 10 seconds it is 0.8(10)^2 = 80 m

average speed between 5 and 10s = (80-20) / (10-5) = 12 m / s answer

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