A block of mass rests on a rough horizontal surface

PHYSICS · Multi-part · CBSE · Physics · Laws of Motion · Laws of Motion

Problem

A block of mass

4.0\,\text{kg}

rests on a rough horizontal surface. Starting from rest, it is acted upon by a horizontal force of

60\,\text{N}

that lasts for

0.40\,\text{s}

. After the force ceases, the block continues to slide and finally stops after moving an additional

5.0\,\text{m}

. Take

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

. (i) Find the speed of the block immediately after the

0.40\,\text{s}

interval. (ii) Calculate the coefficient of kinetic friction between the block and the surface.