A block is sliding on a rough horizontal surface with a speed of when it begins to…

PHYSICS · Single correct · CBSE · Physics · Work, Energy and Power · Work, Energy and Power

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

(b)

0.28

(c)

0.56

(d)

1.28