A book of weight 20N is pressed between two hands and each hand exerts a force of 40N. If the book just starts to slide down. Coefficient of friction is

A book of weight 20N is pressed between two hands and each hand exerts

1.	A book of weight 20N is pressed between two hands and each hand exerts a force of 40N. If the book just starts to slide down. Coefficient of friction is
Answer» 0.25 0.2 0.5 0.1 Solution :`f_(s)=mu_(S)N, MU=(f_(s))/(N)=(MG)/(2F)`