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A trolley accelerates uniformly from res...

A trolley accelerates uniformly from rest and acquires the speed of `72kmh^(-1)` on moving 200m distance, henceforth breaks are applied so that it retards the trolley at a rate which is proportional to the velocity,until its speed is halved,by covering 400m distance further.The total time of motion described of the trolley from the start (approximately)

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