Equation for solving the coefficient of Kinetic friction HELP!?!? Problem: A cable attached to a block of mass 9 kg pulls the block along a horizontal floor at a constant velocity. If the tension in the cable is 5.2 N, what is the coefficient of kinetic friction between the block and the floor? Questions:I have tried to solve this but i really don't know where to begin. Whats the equation to calculate the coefficient of Kinetic Friction??? Attempt: ok i know Mass= Friction/Gravity and gravity is 9.8, u=friction(k)/Normal force Fg= 9kg* (9.8)= 88.2 kg Ef=Ma = 5.2n +Ffk= 9kg * o m/s^2 = Ffk=-5.2 n [uk]= 5.2/100 = 0.052 m/s^2 is this right??? so confused i really just don't have any idea about the the equation...HELP??