Question: A horizontal spring with spring constant 2 1 0 N / mN / m is compressed by 2 0 cmcm and then used to launch

A horizontal spring with spring constant

210

/

/

m is compressed by

20

cmcm and then used to launch a

300

gg box across the floor. The coefficient of kinetic friction between the box and the floor is

0.23 .

Part A

What is the box's launch speed?

Express your answer with the appropriate units.

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vfvf

=

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