Answer:
Force is needed to begin to move the book and force needed to keep the book moving at a constant velocity is 10.78 N and 5.85 N.
Explanation:
Given :
Mass of book , M = 2.03 kg.
Coefficient of static friction , ![\mu_s=0.542 \ .](https://tex.z-dn.net/?f=%5Cmu_s%3D0.542%20%5C%20.)
Coefficient of kinetic friction , ![\mu_k=0.294\ .](https://tex.z-dn.net/?f=%5Cmu_k%3D0.294%5C%20.)
Force, required needed to begin to move the book ,
![F=\mu_sN=\mu_s(mg)=0.542\times 2.03\times 9.8=10.78\ N.](https://tex.z-dn.net/?f=F%3D%5Cmu_sN%3D%5Cmu_s%28mg%29%3D0.542%5Ctimes%202.03%5Ctimes%209.8%3D10.78%5C%20N.)
Now, We know kinetic friction acts when object is in motion .
Therefore , Force, required o keep the book moving at a constant velocity
![F=\mu_kN=\mu_k(mg)=0.294\times 2.03\times 9.8=5.85\ N.](https://tex.z-dn.net/?f=F%3D%5Cmu_kN%3D%5Cmu_k%28mg%29%3D0.294%5Ctimes%202.03%5Ctimes%209.8%3D5.85%5C%20N.)
Hence, this is the required solution.