kinetic energy of a spring

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Question

The system was set vibrating by pulling the thingy down below its equilibrium position and then letting it go from rest

kinetic energy of a spring                           

 

 

If the initial displacement is doubled what happens to the maximum kinetic energy of the thingy?

A: It is unchanged.

B: It is doubled.

C: It is increased by a factor of 4.

D: We can't tell from the information provided

 

 

 

 

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