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20.0-kg block initially sits at rest on a rough horizontal floor. One end of a string...

20.0-kg block initially sits at rest on a rough horizontal floor. One end of a string is attached to the block. You pull on the other end of the string with a force of 40.0 N so that the string makes an angle of 30.0° with the horizontal. After pulling the block 3.00 m across the floor, it is traveling with a speed of 1.25 m/s. What is the magnitude of the force of kinetic friction exerted on the block by the floor?

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