A block with mass mm $=0\mathrm{.}400$ kgkg is attached to one end of an ideal spring and moves on a horizontal frictionless surface. The other end of the spring is attached to a wall. When the block is at xx $=+0\mathrm{.}240$ mm$,$ its acceleration is axax $=-15\mathrm{.}0$ m$/$s$2$m$/$s$2$ and its velocity is vxvx $=+4\mathrm{.}00$ m$/$sm$/$s$.$What is the spring's force constant kk$?$

Express your answer with the appropriate units.

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kk $=$

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Part B

What is the amplitude of the motion?

Express your answer with the appropriate units.

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AA $=$

nothingnothing

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Part C