Two blocks are placed one over the other on the floor. The lower one has a mass of 10 kg and the upper one has a mass of 5 kg. The upper mass has a string tied to it. It is applied a force of 15N in the forward direction. There is no friction between the floor and the lower mass. The two masses start to move together with the same acceleration. Find the value of the frictional force acting between them.
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UP 0 DOWN 0 0 0
