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A block lying on a long horizontal conve...

A block lying on a long horizontal conveyer belt moving at a constant velocity receives a velocity `v_(0) = 5m//s` relative to the ground in the direction opposite to the direction of motion of the conveyer. After `t = 4s`, the velocity of the block becomes equal to the velocity of the belt. The coefficient of friction between the block and the belt is `mu = 0.2`. Determine the velocity v of the conveyer belt.

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