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A truck drives along a horizontal road with a constant velocity. Its motion is retarded and eventually halted by a set of crash barrels. The amount of barrels and sand within the barrels are arranged in such a way to decelerate the truck at a constant rate. Four test runs are performed where the velocity and mass of the truck are varied. In each of the following situations, the barrels stop the truck in the same amount of time.
Input the letters in order from largest stopping force to smallest stopping force. Do not use puncuation.
