A $0\mathrm{.}950$ kgkg block is attached to a spring with spring constant $13\mathrm{.}5$ N$/$mN$/$m$.$ While the block is sitting at rest, a student hits it with a hammer and almost instantaneously gives it a speed of $31\mathrm{.}0$ cm$/$scm$/$s$.$

Part A

What is the amplitude of the subsequent oscillations?

Express your answer with the appropriate units.

View Available Hint$($s$)$for Part A

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AA $=$

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Part B

What is the block's speed at the point where x$=0\mathrm{.}30$Ax$=0\mathrm{.}30$A$?$

Express your answer with the appropriate units.