A spring with spring constant $13$ N$/$mN$/$m hangs from the ceiling. A ball is attached to the spring and allowed to come to rest. It is then pulled down $3\mathrm{.}5$ cmcm and released. The ball makes $25$ oscillations in $25$ seconds.

Part A

What is the mass of the ball?

Express your answer with the appropriate units.

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mm $=$

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Part B

What is its maximum speed?

Express your answer with the appropriate units.

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vmaxvmax $=$

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