Let as consider the next case in the previous illustration when there is no friction between ground and `M` . The coefficient of static and kinetic friction are `mu_(2)` and `mu_(1)`, respectively, and force `F` acts upper block as shown in figure
a. What is the maximum possible value of `F` so that the system moves together ?
b . If there is releative sliding between `M` and `m` then calculate acceleration of `M` and `m`