Types of Brackets

Removal of brackets

The use of grouping symbols (or brackets) in writing algebraic expression

A block of mass m rests on a bracket of mass M. The coefficients of friction between block and bracket are mu_(s) and mu_(k) . The bracket rests on a frictionless surface. What is the maximum force F that can be applied if the block is not to slide on the bracket?

Which of the following orders are correct for property indicated in brackets ? .