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A 91 kg crate, starting from rest, is pulled across a floor with a constant horizontal...

A 91 kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 400 N . For the first 15 m the floor is frictionless, and for the next 15 m the coefficient of friction is 0.20.

What is the final speed of the crate?

Express your answer using two significant figures.

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