Physics

Problem

2\,\text{kg}

block is pushed horizontally against a vertical wall. The coefficient of static friction between the block and the wall is

0.4

. Take

g = 10\,\text{m/s}^2

. The minimum horizontal force required to keep the block from sliding is a)

20\,\text{N}

8\,\text{N}

50\,\text{N}

40\,\text{N}