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A block of mass $m$ is attached to a spring of constant $k$. The maximum speed of the block is $v$.

What is the amplitude of the block?

$ \cfrac {mv}{k} $

$ \cfrac {mk}{v} $

$ \sqrt {\cfrac {k}{m}}v $

$ \sqrt {\cfrac {m}{k}}v $

$ \cfrac {mv^2}{k}$