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YOU NEED TO CLARIFY WHAT N MEANS. IS THAT NEWTONS. THAT IS A TRIGONOMETRY TYPE QUESTIONS. THE KEY TO UNDERSTANDING TRIGONOMETRY OR ALGEBRA QUESTION IS TO LEARN HOW TO INSERT THE VARIABLES IN THE ALGEBRA TYPE QUESTIONS. IT HARD TO EXPLAIN BUT ONCE YOU GET THE HANG OF IT IT EASY. ITS ALL ABOUT INSERTING FORMULAS INTO FORMULAS. LEARN THE DIFFERENCE BETWEEN KINETIC AND STATIC FRICTION THIS ARE CONSTANT IN THE UNIVERSE. I REALLY DON'T HAVE MUCH TIME FOR ALL THIS USE-FULL INFO BUT KINETIC FRICTIONAL FORCE OF THE ROCK STAND STILL MUST BE 200N (NEWTONS ) THIS MUST BE ONE OF THOSE FOR EVERY REACTION THERE AN EQUAL REACTION TYPE QUESTION.