1. The problem statement, all variables and given/known data Block is pushed across a horizontal surface with a coefficient of kinetic friction of 0.15 by applying a 150N horizontal force the block accelerates at a rate of 2.53m/s^2 find the mass of the block 2. Relevant equations Uf=ff/fn f=ma 3. The attempt at a solution 0.15=?/fn f=m2.53 I tried crazy solutions but no progress The TB answer is 38kg. I have no idea what this 150N of force is, i tried using it as the net force or frictional force but it didnt work, what is it and what do i do?