Question: A horizontal spring with spring constant 1 2 0 N / mN / m is compressed 1 5 cmcm and used to launch a 2

A horizontal spring with spring constant

120

/

/

m is compressed

15

cmcm and used to launch a

2.5

kgkg box across a frictionless, horizontal surface. After the box travels some distance, the surface becomes rough. The coefficient of kinetic friction of the box on the surface is

0.15 .

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