Physics

Problem

1\,\text{kg}

block is sliding on a rough horizontal surface with a speed of

3\,\text{m}\,\text{s}^{-1}

when it begins to compress a spring of force constant

100\,\text{N}\,\text{m}^{-1}

placed on the same surface. The block comes to rest after compressing the spring by

0.25\,\text{m}

. Assuming the surface offers uniform kinetic friction throughout the compression (take

g = 9.8\,\text{m}\,\text{s}^{-2}

), the coefficient of kinetic friction between the block and the surface is closest to a)

0.71

0.28

0.56

1.28