A7.5-kg block is sliding down a wall with constant velocity. the coefficient of static friction between the block and the wall is ? s = 0.70. the coefficient of kinetic friction between the block and the wall is ? k = 0.40. what is the magnitude of the force (in n) pressing the block against the wall? use g = 9.79 m/s2. never include units with any answer to a numerical question.